{"id":3005,"slug":"weighted-rgb-blend","title":"Blend two colours","summary":"Choose two colours and a mix amount. The output is a weighted RGB blend.","library":"learning","relationship_type":"transforms","relationship":"Each red, green and blue channel is interpolated using the mix amount of the first colour and the remainder of the second. The displayed result is rounded to the nearest channel value.","input":{"blocks":[{"type":"colour","width":"full","data":{"name":"First colour","hex":"#84CC16","group":"first","role":"fill","mix":"","mixFrom":"","proportion":65,"channels":false,"adjustProportion":true,"layout":{"x":0,"y":0,"w":50,"h":100}}},{"type":"colour","width":"full","data":{"name":"Second colour","hex":"#52C98B","group":"second","role":"fill","mix":"","mixFrom":"","proportion":35,"channels":false,"adjustProportion":true,"layout":{"x":50,"y":0,"w":50,"h":100}}}]},"output":{"blocks":[{"type":"colour","width":"full","data":{"name":"Weighted blend","hex":"#73CB3F","group":"mix","role":"fill","mix":"average","mixFrom":"first,second","proportion":100,"channels":false,"adjustProportion":false,"layout":{"x":0,"y":0,"w":100,"h":100}}}]},"categories":[{"name":"Colour and Design","slug":"colour-design"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"CSS Color Module Level 4","url":"https://www.w3.org/TR/css-color-4/","publisher":"W3C","licence":"CC-BY-4.0"},{"title":"W3C Compositing and Blending Level 1","url":"https://www.w3.org/TR/compositing-1/","publisher":"W3C","licence":"CC-BY-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":true,"block_types":["colour"],"provenance":null,"published_at":"2026-08-14 19:51:00","updated_at":"2026-08-14 20:43:38"}
{"id":2641,"slug":"chemistry-hydrogen-combustion","title":"Hydrogen and oxygen form water","summary":"2 H₂ + O₂ → 2 H₂O. Change the hydrogen amount to calculate the theoretical water produced.","library":"learning","relationship_type":"produces","relationship":"Ignition supplies activation energy so hydrogen and oxygen bonds can break and rearrange into water. The balanced coefficients conserve every atom and set a 1:1 molar ratio between hydrogen and water. Use the calculator to scale the balanced molar relationship to any amount of 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{"id":142,"slug":"celsius-to-fahrenheit","title":"Convert Celsius to Fahrenheit","summary":"Enter any Celsius temperature to calculate Fahrenheit.","library":"learning","relationship_type":"solves","relationship":"Multiply Celsius by nine fifths, then add 32.","input":{"blocks":[{"type":"variable","width":"full","data":{"name":"celsius","label":"Celsius","value":"20","unit":"°C","min":"-273.15","max":"1000","step":"0.1","expression":""}}]},"output":{"blocks":[{"type":"variable","width":"full","data":{"name":"fahrenheit","label":"Fahrenheit","value":"68","unit":"°F","min":"-459.67","max":"1832","step":"0.1","expression":"(celsius * 9 / 5) + 32"}}]},"categories":[{"name":"Mathematics","slug":"mathematics"}],"topics":[{"name":"Mathematics","slug":"mathematics"}],"sources":[{"title":"NIST Guide for the Use of the International System of Units","url":"https://physics.nist.gov/cuu/pdf/sp811.pdf","publisher":"National Institute of Standards and Technology","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"generated","is_example":true,"block_types":["variable"],"provenance":null,"published_at":"2026-08-14 15:40:45","updated_at":"2026-08-14 20:43:38"}
{"id":143,"slug":"arithmetic-sequence-term","title":"Explore an arithmetic sequence","summary":"Change the starting value, common difference and term number to calculate any term.","library":"general","relationship_type":"solves","relationship":"For an arithmetic sequence, a(n) = start + (n - 1) × step.","input":{"blocks":[{"type":"variable","width":"third","data":{"name":"start","label":"Starting value","value":"1","unit":"","min":"-100","max":"100","step":"1","expression":""}},{"type":"variable","width":"third","data":{"name":"step","label":"Common difference","value":"2","unit":"","min":"-50","max":"50","step":"1","expression":""}},{"type":"variable","width":"third","data":{"name":"n","label":"Term number","value":"6","unit":"","min":"1","max":"100","step":"1","expression":""}}]},"output":{"blocks":[{"type":"variable","width":"full","data":{"name":"term","label":"Term value","value":"11","unit":"","min":"-10000","max":"10000","step":"1","expression":"start + (n - 1) * step"}}]},"categories":[{"name":"Puzzles and Riddles","slug":"puzzles-riddles"}],"topics":[{"name":"Logic","slug":"logic"}],"sources":[{"title":"mathworld.wolfram.com: Explore an arithmetic sequence","url":"https://mathworld.wolfram.com/ArithmeticProgression.html","publisher":"mathworld.wolfram.com","licence":"Reference"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"generated","is_example":true,"block_types":["variable"],"provenance":null,"published_at":"2026-08-14 15:30:45","updated_at":"2026-08-14 20:43:38"}
{"id":2656,"slug":"chemistry-methane-combustion","title":"Methane undergoes complete combustion","summary":"CH4 + 2 O2 -> CO2 + 2 H2O. A blue flame releases heat; carbon dioxide and water form.","library":"learning","relationship_type":"produces","relationship":"Carbon and hydrogen atoms in methane are oxidised to carbon dioxide and water. 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{"id":146,"slug":"kilometres-to-miles","title":"Convert kilometres to miles","summary":"Enter any distance in kilometres to calculate miles.","library":"learning","relationship_type":"solves","relationship":"Multiply kilometres by 0.621371 to obtain statute miles.","input":{"blocks":[{"type":"variable","width":"full","data":{"name":"kilometres","label":"Kilometres","value":"1","unit":"km","min":"0","max":"10000","step":"0.1","expression":""}}]},"output":{"blocks":[{"type":"variable","width":"full","data":{"name":"miles","label":"Miles","value":"0.621371","unit":"mi","min":"0","max":"6213.71","step":"0.1","expression":"kilometres * 0.621371"}}]},"categories":[{"name":"Mathematics","slug":"mathematics"}],"topics":[{"name":"Mathematics","slug":"mathematics"}],"sources":[{"title":"www.nist.gov: Convert kilometres to miles","url":"https://www.nist.gov/pml/owm/si-units","publisher":"www.nist.gov","licence":"US-PUBLIC-DOMAIN"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"generated","is_example":false,"block_types":["variable"],"provenance":null,"published_at":"2026-08-14 15:00:45","updated_at":"2026-08-14 20:43:38"}
{"id":140,"slug":"nine-dots-require-lines-outside-the-square","title":"Four lines solve the nine-dot puzzle by extending beyond the grid","summary":"The apparent square boundary is not part of the stated constraint.","library":"general","relationship_type":"solves","relationship":"Begin near a corner and extend lines beyond the outer dots so later segments can change direction at useful points outside the imagined square.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Nine dots in a three-by-three grid to be crossed with four connected straight lines"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"All nine dots crossed without lifting the pen"}}]},"categories":[{"name":"Puzzles and Riddles","slug":"puzzles-riddles"}],"topics":[{"name":"Logic","slug":"logic"}],"sources":[{"title":"en.wikipedia.org: Four lines solve the nine-dot puzzle by extending beyond the grid","url":"https://en.wikipedia.org/wiki/Nine_dots_puzzle","publisher":"en.wikipedia.org","licence":"CC-BY-SA-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:51:11","updated_at":"2026-08-14 14:51:11"}
{"id":139,"slug":"two-guards-one-question-finds-safe-door","title":"One question defeats a liar and a truth-teller","summary":"Asking either guard to report the other’s answer forces the same false direction.","library":"general","relationship_type":"solves","relationship":"Ask either guard which door the other guard would identify as safe. The truthful guard reports the liar’s wrong choice; the liar lies about the truthful guard’s correct choice.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Two guarded doors, one safe, with one guard always truthful and one always lying"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Choose the opposite door to find the safe route"}}]},"categories":[{"name":"Puzzles and Riddles","slug":"puzzles-riddles"}],"topics":[{"name":"Logic","slug":"logic"}],"sources":[{"title":"en.wikipedia.org: One question defeats a liar and a truth-teller","url":"https://en.wikipedia.org/wiki/Knights_and_Knaves","publisher":"en.wikipedia.org","licence":"CC-BY-SA-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:51:10","updated_at":"2026-08-14 14:51:11"}
{"id":138,"slug":"one-hundred-doors-leave-square-numbers-open","title":"The hundred doors puzzle leaves perfect squares open","summary":"Only perfect squares have an odd number of positive divisors.","library":"general","relationship_type":"reveals","relationship":"Door n is toggled once for every divisor of n. Divisors normally pair, giving an even count, except when a square root pairs with itself.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"One hundred closed doors toggled on passes numbered 1 through 100"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Doors 1, 4, 9 through 100 remain open"}}]},"categories":[{"name":"Puzzles and Riddles","slug":"puzzles-riddles"}],"topics":[{"name":"Logic","slug":"logic"}],"sources":[{"title":"en.wikipedia.org: The hundred doors puzzle leaves perfect squares open","url":"https://en.wikipedia.org/wiki/100_doors","publisher":"en.wikipedia.org","licence":"CC-BY-SA-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:51:10","updated_at":"2026-08-14 14:51:10"}
{"id":137,"slug":"tower-of-hanoi-needs-seven-moves-for-three-disks","title":"Three Tower of Hanoi disks require seven moves","summary":"Move the upper stack aside, move the largest disk, then rebuild the stack.","library":"general","relationship_type":"solves","relationship":"Move the top two disks to a spare peg in three moves, move the largest disk once, then move the two-disk stack onto it in three more moves.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Three different-sized disks stacked largest to smallest and two empty pegs"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"All disks transferred legally in the minimum seven moves"}}]},"categories":[{"name":"Puzzles and Riddles","slug":"puzzles-riddles"}],"topics":[{"name":"Logic","slug":"logic"}],"sources":[{"title":"en.wikipedia.org: Three Tower of Hanoi disks require seven moves","url":"https://en.wikipedia.org/wiki/Tower_of_Hanoi","publisher":"en.wikipedia.org","licence":"CC-BY-SA-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:51:09","updated_at":"2026-08-14 14:51:10"}
{"id":136,"slug":"monty-hall-switching-wins-two-thirds","title":"Switching doors wins two thirds of Monty Hall games","summary":"The host’s informed reveal transfers the original two-door probability to the remaining closed door.","library":"general","relationship_type":"solves","relationship":"The first choice has probability one third of being correct. The other two doors jointly hold probability two thirds; after the host deliberately removes a losing one, that probability remains with the only other closed door.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Three doors, one prize, an initial choice and a host who always reveals a goat"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Switching wins with probability two thirds"}}]},"categories":[{"name":"Puzzles and Riddles","slug":"puzzles-riddles"}],"topics":[{"name":"Logic","slug":"logic"}],"sources":[{"title":"en.wikipedia.org: Switching doors wins two thirds of Monty Hall games","url":"https://en.wikipedia.org/wiki/Monty_Hall_problem","publisher":"en.wikipedia.org","licence":"CC-BY-SA-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:51:09","updated_at":"2026-08-14 14:51:09"}
{"id":135,"slug":"why-sound-travels-faster-in-water","title":"Why does sound travel faster in water than in air?","summary":"Water’s greater stiffness transmits pressure disturbances faster despite its density.","library":"general","relationship_type":"answers","relationship":"Sound speed depends on the medium’s resistance to compression relative to density. Liquid water is far less compressible than air, producing the higher propagation speed.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"The same sound-frequency disturbance moving through air and liquid water"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"The disturbance reaches a given underwater distance sooner"}}]},"categories":[{"name":"Questions and Answers","slug":"questions-answers"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"oceanservice.noaa.gov: Why does sound travel faster in water than in air?","url":"https://oceanservice.noaa.gov/facts/sound.html","publisher":"oceanservice.noaa.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:51:08","updated_at":"2026-08-14 14:51:09"}
{"id":134,"slug":"why-rain-has-an-earthy-smell","title":"Why can rain produce an earthy smell?","summary":"Raindrops release aromatic compounds and microbial geosmin from porous ground.","library":"general","relationship_type":"answers","relationship":"Drops trap tiny air bubbles at the surface. Bursting bubbles form aerosols that carry accumulated plant oils and geosmin into the surrounding air.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Rain beginning after a dry period on soil or rock"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"An earthy scent known as petrichor"}}]},"categories":[{"name":"Questions and Answers","slug":"questions-answers"}],"topics":[{"name":"Chemistry","slug":"chemistry"}],"sources":[{"title":"news.mit.edu: Why can rain produce an earthy smell?","url":"https://news.mit.edu/2015/rainfall-can-release-aerosols-0114","publisher":"news.mit.edu","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:51:08","updated_at":"2026-08-14 14:51:08"}
{"id":133,"slug":"why-hot-air-rises","title":"Why does warmer air tend to rise?","summary":"Heating lowers density when air can expand at roughly constant pressure.","library":"general","relationship_type":"answers","relationship":"Faster molecular motion makes the parcel expand. Its mass is then spread through a larger volume, and the denser surrounding air provides a net upward buoyant force.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A parcel of air warmed relative to surrounding air"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"The warmer parcel moves upward until forces and temperature differences change"}}]},"categories":[{"name":"Questions and Answers","slug":"questions-answers"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"www.weather.gov: Why does warmer air tend to rise?","url":"https://www.weather.gov/jetstream/layers","publisher":"www.weather.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:51:07","updated_at":"2026-08-14 14:51:08"}
{"id":132,"slug":"why-soap-bubbles-are-round","title":"Why are free soap bubbles round?","summary":"Surface tension favours the smallest surface area for an enclosed volume.","library":"general","relationship_type":"answers","relationship":"Molecules in the film pull along its surface. For a given enclosed volume, a sphere minimises area, so unequal curvature is smoothed toward that shape.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A flexible soap film enclosing air away from nearby surfaces"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"An approximately spherical bubble"}}]},"categories":[{"name":"Questions and Answers","slug":"questions-answers"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"www.britannica.com: Why are free soap bubbles round?","url":"https://www.britannica.com/science/surface-tension","publisher":"www.britannica.com","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:51:07","updated_at":"2026-08-14 14:51:07"}
{"id":131,"slug":"why-cut-onions-make-eyes-water","title":"Why do cut onions make eyes water?","summary":"Damaged onion cells release volatile compounds that irritate the eye surface.","library":"general","relationship_type":"answers","relationship":"Cutting mixes previously separated enzymes and sulphur-containing precursors. A volatile irritant reaches the tear film, where sensory nerves trigger protective tearing.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"An onion cut open near unprotected eyes"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Eyes produce tears that dilute and wash away the irritant"}}]},"categories":[{"name":"Questions and Answers","slug":"questions-answers"}],"topics":[{"name":"Chemistry","slug":"chemistry"}],"sources":[{"title":"www.loc.gov: Why do cut onions make eyes water?","url":"https://www.loc.gov/everyday-mysteries/food-and-nutrition/item/why-do-onions-make-you-cry/","publisher":"www.loc.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:51:06","updated_at":"2026-08-14 14:51:07"}
{"id":130,"slug":"standardised-units-enable-comparable-measurement","title":"Standardised units make measurements comparable","summary":"A shared definition lets different instruments express the same quantity consistently.","library":"learning","relationship_type":"causes","relationship":"Calibration links each instrument through documented comparisons to the same unit definition and uncertainty framework.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Two laboratories measuring length with instruments traceable to the metre"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Results that can be compared meaningfully across locations"}}]},"categories":[{"name":"Society and Systems","slug":"society-systems"}],"topics":[{"name":"Communication","slug":"communication"}],"sources":[{"title":"www.bipm.org: Standardised units make measurements comparable","url":"https://www.bipm.org/en/measurement-units","publisher":"www.bipm.org","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:51:06","updated_at":"2026-08-14 14:51:06"}
{"id":129,"slug":"secret-ballot-reduces-direct-retaliation","title":"A secret ballot reduces direct pressure on individual voters","summary":"Separating identity from the recorded choice makes retaliation harder.","library":"learning","relationship_type":"causes","relationship":"Officials record participation separately from the anonymous ballot. Observers can assess totals without linking a published choice back to an individual.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"An election process that verifies eligibility but does not expose each voter’s selection"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Voters better able to choose without proving their vote to another person"}}]},"categories":[{"name":"Society and Systems","slug":"society-systems"}],"topics":[{"name":"Communication","slug":"communication"}],"sources":[{"title":"www.idea.int: A secret ballot reduces direct pressure on individual voters","url":"https://www.idea.int/data-tools/data/voter-turnout-database","publisher":"www.idea.int","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:51:05","updated_at":"2026-08-14 14:51:06"}
{"id":128,"slug":"double-entry-bookkeeping-balances-transactions","title":"Double-entry bookkeeping records both sides of a transaction","summary":"Equal debits and credits preserve the accounting equation.","library":"learning","relationship_type":"transforms","relationship":"The transaction increases the equipment asset account and decreases the cash asset account by equal amounts. The paired entries keep total debits and credits balanced.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A business buying equipment for cash"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Updated accounts that retain an internally checkable balance"}}]},"categories":[{"name":"Society and Systems","slug":"society-systems"}],"topics":[{"name":"Communication","slug":"communication"}],"sources":[{"title":"openstax.org: Double-entry bookkeeping records both sides of a transaction","url":"https://openstax.org/books/principles-financial-accounting/pages/3-1-describe-principles-assumptions-and-concepts-of-accounting-and-their-relationship-to-financial-statements","publisher":"openstax.org","licence":"CC-BY-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:51:05","updated_at":"2026-08-14 14:51:05"}
{"id":127,"slug":"random-sampling-reduces-selection-bias","title":"Random sampling reduces systematic selection bias","summary":"Known selection probabilities prevent researchers from choosing only convenient cases.","library":"learning","relationship_type":"causes","relationship":"Each eligible member has a known chance of selection independent of the researcher’s preferences. Nonresponse and coverage problems still require attention.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A defined population and a genuinely random method for selecting members"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A sample less shaped by deliberate or convenient selection"}}]},"categories":[{"name":"Society and Systems","slug":"society-systems"}],"topics":[{"name":"Mathematics","slug":"mathematics"}],"sources":[{"title":"www.itl.nist.gov: Random sampling reduces systematic selection bias","url":"https://www.itl.nist.gov/div898/handbook/pri/section3/pri332.htm","publisher":"www.itl.nist.gov","licence":"US-PUBLIC-DOMAIN"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:51:04","updated_at":"2026-08-14 14:51:05"}
{"id":126,"slug":"clear-agenda-focuses-a-meeting","title":"A clear agenda focuses a meeting","summary":"Shared topics, owners and time limits reduce uncertainty about the work.","library":"learning","relationship_type":"causes","relationship":"Participants can prepare before arrival and recognise when discussion leaves the stated objective. The facilitator can allocate time and record decisions against each item.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A meeting invitation with outcomes, ordered topics and preparation notes"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A meeting more likely to finish with explicit decisions and actions"}}]},"categories":[{"name":"Society and Systems","slug":"society-systems"}],"topics":[{"name":"Communication","slug":"communication"}],"sources":[{"title":"www.atlassian.com: A clear agenda focuses a meeting","url":"https://www.atlassian.com/software/confluence/templates/meeting-notes","publisher":"www.atlassian.com","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:51:04","updated_at":"2026-08-14 14:51:04"}
{"id":125,"slug":"reversing-a-hinge-screw-tightens-a-door","title":"A longer hinge screw can correct a mildly sagging door","summary":"The screw pulls the upper hinge toward solid framing instead of loose surface wood.","library":"learning","relationship_type":"solves","relationship":"Replace one suitable upper-hinge screw with a longer compatible screw that reaches sound framing, then tighten gradually while checking alignment.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A door rubbing because its upper hinge has loosened from the frame"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"The door lifted closer to its intended alignment"}}]},"categories":[{"name":"Practical Skills","slug":"practical-skills"}],"topics":[{"name":"Practical Skills","slug":"practical-skills"}],"sources":[{"title":"www.nist.gov: A longer hinge screw can correct a mildly sagging door","url":"https://www.nist.gov/pml/owm/si-units-length","publisher":"www.nist.gov","licence":"US-PUBLIC-DOMAIN"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:51:03","updated_at":"2026-08-14 14:51:04"}
{"id":124,"slug":"mulch-reduces-soil-water-loss","title":"Mulch reduces evaporation from garden soil","summary":"A surface layer blocks sun and slows air movement at damp soil.","library":"learning","relationship_type":"causes","relationship":"The cover shades the surface and maintains a more humid, less windy boundary layer. Water therefore leaves the soil more slowly.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Moist soil covered with an appropriate layer of organic mulch"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Soil that remains moist for longer between watering"}}]},"categories":[{"name":"Practical Skills","slug":"practical-skills"}],"topics":[{"name":"Biology","slug":"biology"}],"sources":[{"title":"www.epa.gov: Mulch reduces evaporation from garden soil","url":"https://www.epa.gov/watersense/what-plant","publisher":"www.epa.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:51:03","updated_at":"2026-08-14 14:51:03"}
{"id":123,"slug":"torque-wrench-controls-fastener-tightness","title":"A torque wrench controls fastener tightening","summary":"The tool signals when rotational force reaches its setting.","library":"learning","relationship_type":"transforms","relationship":"Apply smooth force at the handle until the tool indicates its preset torque. Stop at the signal rather than adding an extra pull.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A compatible fastener tightened with a correctly set and calibrated torque wrench"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A fastener tightened near the specified torque"}}]},"categories":[{"name":"Practical Skills","slug":"practical-skills"}],"topics":[{"name":"Practical Skills","slug":"practical-skills"}],"sources":[{"title":"www.nist.gov: A torque wrench controls fastener tightening","url":"https://www.nist.gov/calibrations/torque-calibrations","publisher":"www.nist.gov","licence":"US-PUBLIC-DOMAIN"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:51:02","updated_at":"2026-08-14 14:51:03"}
{"id":122,"slug":"sharpening-restores-a-knife-edge","title":"Sharpening restores a knife’s narrow cutting edge","summary":"Controlled abrasion removes metal until two bevels meet cleanly.","library":"learning","relationship_type":"transforms","relationship":"Alternating strokes at a stable angle remove rounded or damaged material. Progressively finer abrasion refines the new apex and reduces the burr.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A dull knife drawn consistently across an appropriate sharpening stone"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A thinner, more regular edge that cuts with less force"}}]},"categories":[{"name":"Practical Skills","slug":"practical-skills"}],"topics":[{"name":"Practical Skills","slug":"practical-skills"}],"sources":[{"title":"www.fsis.usda.gov: Sharpening restores a knife’s narrow cutting edge","url":"https://www.fsis.usda.gov/food-safety/safe-food-handling-and-preparation/food-safety-basics/kitchen-companion","publisher":"www.fsis.usda.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:51:02","updated_at":"2026-08-14 14:51:02"}
{"id":121,"slug":"blanching-slows-vegetable-enzyme-activity","title":"Blanching slows quality loss in frozen vegetables","summary":"Brief heating inactivates enzymes before cold storage.","library":"learning","relationship_type":"causes","relationship":"Heat reduces activity of enzymes that would otherwise continue changing colour, flavour and texture. Rapid cooling stops further cooking before freezing.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Prepared vegetables briefly placed in boiling water or steam, then cooled"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Vegetables better able to retain quality during frozen storage"}}]},"categories":[{"name":"Practical Skills","slug":"practical-skills"}],"topics":[{"name":"Cooking","slug":"cooking"}],"sources":[{"title":"nchfp.uga.edu: Blanching slows quality loss in frozen vegetables","url":"https://nchfp.uga.edu/how/freeze/blanching.html","publisher":"nchfp.uga.edu","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:51:01","updated_at":"2026-08-14 14:51:02"}
{"id":120,"slug":"digital-signature-verifies-message-origin","title":"A digital signature verifies a message against a public key","summary":"Public-key mathematics connects the signature to both the message and signer’s private key.","library":"learning","relationship_type":"reveals","relationship":"Verification recomputes message-dependent values and checks the signature equation with the public key. A changed message or unrelated key fails the check.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A message, its digital signature and a trusted public key"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A valid or invalid signature result"}}]},"categories":[{"name":"Technology","slug":"technology"}],"topics":[{"name":"Computing","slug":"computing"}],"sources":[{"title":"csrc.nist.gov: A digital signature verifies a message against a public key","url":"https://csrc.nist.gov/projects/digital-signatures","publisher":"csrc.nist.gov","licence":"US-PUBLIC-DOMAIN"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:51:01","updated_at":"2026-08-14 14:51:01"}
{"id":119,"slug":"error-correction-recovers-damaged-data","title":"Error-correcting codes can recover damaged data","summary":"Redundant check information identifies and repairs limited symbol errors.","library":"learning","relationship_type":"transforms","relationship":"The decoder tests consistency relationships among received symbols. When damage remains within the code’s designed limit, it identifies the likely error pattern and corrects it.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A transmitted message encoded with sufficient error-correction redundancy"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"The original message reconstructed despite limited transmission errors"}}]},"categories":[{"name":"Technology","slug":"technology"}],"topics":[{"name":"Computing","slug":"computing"}],"sources":[{"title":"www.nist.gov: Error-correcting codes can recover damaged data","url":"https://www.nist.gov/publications/error-correction-codes","publisher":"www.nist.gov","licence":"US-PUBLIC-DOMAIN"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:51:00","updated_at":"2026-08-14 14:51:01"}
{"id":118,"slug":"binary-search-halves-a-sorted-list","title":"Binary search halves a sorted search space","summary":"Each comparison rules out one side of an ordered list.","library":"learning","relationship_type":"solves","relationship":"Compare the target with the middle item. Continue only in the half that can contain it, repeating until found or no items remain.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A target value and a sorted list of 1,024 items"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"The target located or excluded in at most about ten comparisons"}}]},"categories":[{"name":"Technology","slug":"technology"}],"topics":[{"name":"Computing","slug":"computing"}],"sources":[{"title":"xlinux.nist.gov: Binary search halves a sorted search space","url":"https://xlinux.nist.gov/dads/HTML/binarySearch.html","publisher":"xlinux.nist.gov","licence":"US-PUBLIC-DOMAIN"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":true,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:51:00","updated_at":"2026-08-14 20:43:39"}
{"id":117,"slug":"gps-uses-timed-signals-to-estimate-position","title":"GPS turns timed satellite signals into a position estimate","summary":"Signal travel times constrain the receiver’s distance from several satellites.","library":"learning","relationship_type":"transforms","relationship":"The receiver compares transmission and arrival times, accounts for clock error, and solves intersecting distance constraints using satellite orbit data.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Timestamped radio signals from multiple GPS satellites"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"An estimated position, time and often velocity"}}]},"categories":[{"name":"Technology","slug":"technology"}],"topics":[{"name":"Computing","slug":"computing"}],"sources":[{"title":"www.gps.gov: GPS turns timed satellite signals into a position estimate","url":"https://www.gps.gov/systems/gps/performance/accuracy/","publisher":"www.gps.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:50:59","updated_at":"2026-08-14 14:51:00"}
{"id":116,"slug":"cryptographic-hash-detects-file-change","title":"A cryptographic hash reveals whether file bytes changed","summary":"The same bytes reproduce the same digest while a changed input almost certainly does not.","library":"learning","relationship_type":"reveals","relationship":"Calculate SHA-256 over the downloaded bytes and compare the result with the trusted value. An exact match supports integrity but does not by itself prove who created the file.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A downloaded file and its publisher’s trusted SHA-256 digest"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A matching digest or a clear integrity warning"}}]},"categories":[{"name":"Technology","slug":"technology"}],"topics":[{"name":"Computing","slug":"computing"}],"sources":[{"title":"csrc.nist.gov: A cryptographic hash reveals whether file bytes changed","url":"https://csrc.nist.gov/projects/hash-functions","publisher":"csrc.nist.gov","licence":"US-PUBLIC-DOMAIN"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:50:59","updated_at":"2026-08-14 14:50:59"}
{"id":115,"slug":"percentage-change-compares-to-starting-value","title":"Percentage change compares a difference with its starting value","summary":"Normalising by the original value makes changes comparable across scales.","library":"learning","relationship_type":"transforms","relationship":"Subtract the original value to obtain 20, divide by the original 80, then multiply by 100 percent.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A quantity increasing from 80 to 100"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A 25 percent increase"}}]},"categories":[{"name":"Mathematics","slug":"mathematics"}],"topics":[{"name":"Mathematics","slug":"mathematics"}],"sources":[{"title":"www.nist.gov: Percentage change compares a difference with its starting value","url":"https://www.nist.gov/pml/owm/si-units-information","publisher":"www.nist.gov","licence":"US-PUBLIC-DOMAIN"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:50:58","updated_at":"2026-08-14 14:50:59"}
{"id":114,"slug":"slope-measures-vertical-change-per-horizontal-change","title":"Slope converts two points into a rate of change","summary":"Subtracting coordinates compares vertical change with horizontal change.","library":"learning","relationship_type":"transforms","relationship":"The vertical change is 11 − 3 = 8 and the horizontal change is 6 − 2 = 4. Divide the first by the second.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Points (2, 3) and (6, 11) on a line"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A slope of 2 vertical units per horizontal unit"}}]},"categories":[{"name":"Mathematics","slug":"mathematics"}],"topics":[{"name":"Geometry","slug":"geometry"}],"sources":[{"title":"mathworld.wolfram.com: Slope converts two points into a rate of change","url":"https://mathworld.wolfram.com/Slope.html","publisher":"mathworld.wolfram.com","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:50:58","updated_at":"2026-08-14 14:50:58"}
{"id":113,"slug":"two-fair-coins-produce-four-outcomes","title":"Two fair coin tosses produce four equally likely ordered outcomes","summary":"A product rule combines the two choices available on each toss.","library":"learning","relationship_type":"demonstrates","relationship":"List the ordered pairs HH, HT, TH and TT. Independence gives each pair probability one half multiplied by one half.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Two independent tosses of a fair coin"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Four outcomes, each with probability one quarter"}}]},"categories":[{"name":"Mathematics","slug":"mathematics"}],"topics":[{"name":"Mathematics","slug":"mathematics"}],"sources":[{"title":"www.itl.nist.gov: Two fair coin tosses produce four equally likely ordered outcomes","url":"https://www.itl.nist.gov/div898/handbook/eda/section3/eda3660.htm","publisher":"www.itl.nist.gov","licence":"US-PUBLIC-DOMAIN"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:50:57","updated_at":"2026-08-14 14:50:58"}
{"id":112,"slug":"compound-interest-reinvests-growth","title":"Compound interest applies growth to previous growth","summary":"Each period uses the accumulated balance as the next starting value.","library":"learning","relationship_type":"produces","relationship":"After one period the balance is 110. Applying the same rate to 110 produces 121, which includes growth on the first period’s increase.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A balance of 100 growing by 10 percent for two periods"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A balance of 121 after two periods"}}]},"categories":[{"name":"Mathematics","slug":"mathematics"}],"topics":[{"name":"Mathematics","slug":"mathematics"}],"sources":[{"title":"www.investor.gov: Compound interest applies growth to previous growth","url":"https://www.investor.gov/financial-tools-calculators/calculators/compound-interest-calculator","publisher":"www.investor.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:50:57","updated_at":"2026-08-14 14:50:57"}
{"id":111,"slug":"pythagorean-theorem-finds-hypotenuse","title":"The Pythagorean theorem finds a right triangle’s hypotenuse","summary":"The squared side lengths of a right triangle satisfy a fixed relationship.","library":"learning","relationship_type":"solves","relationship":"Add the squared leg lengths to get 3² + 4² = 25, then take the positive square root because a length cannot be negative.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A right triangle with perpendicular sides of 3 and 4 units"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A hypotenuse length of 5 units"}}]},"categories":[{"name":"Mathematics","slug":"mathematics"}],"topics":[{"name":"Geometry","slug":"geometry"}],"sources":[{"title":"mathworld.wolfram.com: The Pythagorean theorem finds a right triangle’s hypotenuse","url":"https://mathworld.wolfram.com/PythagoreanTheorem.html","publisher":"mathworld.wolfram.com","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:50:56","updated_at":"2026-08-14 14:50:57"}
{"id":110,"slug":"polarising-filter-reduces-reflected-glare","title":"A polarising filter can reduce reflected glare","summary":"Rotation blocks much of the strongly polarised light from a non-metallic reflection.","library":"learning","relationship_type":"causes","relationship":"Reflected light is often preferentially polarised. Aligning the filter to reject that orientation reduces the reflection while transmitting other scene light.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A camera viewing reflective water through a rotated polarising filter"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Less glare and clearer detail beneath or beyond the reflection"}}]},"categories":[{"name":"Colour and Design","slug":"colour-design"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"www.britannica.com: A polarising filter can reduce reflected glare","url":"https://www.britannica.com/science/polarization-physics","publisher":"www.britannica.com","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:50:56","updated_at":"2026-08-14 14:50:56"}
{"id":109,"slug":"lower-opacity-blends-with-background","title":"Lower opacity blends a foreground with its background","summary":"Alpha compositing weights foreground and background colour values.","library":"learning","relationship_type":"transforms","relationship":"A 50 percent cyan layer over white is a weighted average of the two colours, not either colour unchanged.","input":{"blocks":[{"type":"colour","width":"full","data":{"name":"Background","hex":"#FFFFFF","group":"bg","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":0,"y":0,"w":100,"h":100}}},{"type":"colour","width":"full","data":{"name":"Cyan layer","hex":"#19C3E6","group":"fg","role":"fill","mix":"","mixFrom":"","proportion":50,"channels":false,"layout":{"x":18,"y":18,"w":64,"h":64}}}]},"output":{"blocks":[{"type":"colour","width":"full","data":{"name":"Composite","hex":"#8CE1F3","group":"mix","role":"fill","mix":"over","mixFrom":"fg,bg","proportion":50,"channels":false,"layout":{"x":0,"y":0,"w":100,"h":100}}}]},"categories":[{"name":"Colour and Design","slug":"colour-design"}],"topics":[{"name":"Computing","slug":"computing"},{"name":"Physics","slug":"physics"}],"sources":[{"title":"W3C Compositing and Blending Level 1","url":"https://www.w3.org/TR/compositing-1/","publisher":"W3C","licence":"CC-BY-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":2,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["colour"],"provenance":null,"published_at":"2026-08-14 14:50:55","updated_at":"2026-08-14 19:20:09"}
{"id":108,"slug":"complementary-colours-increase-edge-contrast","title":"Complementary colours create strong visual separation","summary":"Large hue differences make a shared edge easier to distinguish.","library":"learning","relationship_type":"causes","relationship":"Neighbouring colours stimulate different opponent channels. Lightness contrast makes the boundary even more prominent.","input":{"blocks":[{"type":"colour","width":"full","data":{"name":"Violet","hex":"#6D28D9","group":"violet","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":0,"y":0,"w":50,"h":100}}},{"type":"colour","width":"full","data":{"name":"Lime","hex":"#84CC16","group":"lime","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":50,"y":0,"w":50,"h":100}}}]},"output":{"blocks":[{"type":"colour","width":"full","data":{"name":"Violet","hex":"#6D28D9","group":"violet","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":0,"y":0,"w":50,"h":100}}},{"type":"colour","width":"full","data":{"name":"Lime","hex":"#84CC16","group":"lime","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":50,"y":0,"w":50,"h":100}}}]},"categories":[{"name":"Colour and Design","slug":"colour-design"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"Britannica: Color vision","url":"https://www.britannica.com/science/color/Color-vision","publisher":"Encyclopaedia Britannica","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":2,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["colour"],"provenance":null,"published_at":"2026-08-14 14:50:55","updated_at":"2026-08-14 19:20:09"}
{"id":107,"slug":"cyan-magenta-yellow-ink-darkens","title":"Cyan, magenta and yellow inks combine toward a dark neutral","summary":"Each subtractive ink removes a different portion of reflected white light.","library":"learning","relationship_type":"produces","relationship":"Overlap multiplies remaining reflected light. Real process inks usually still need black for a clean dark neutral.","input":{"blocks":[{"type":"colour","width":"full","data":{"name":"Cyan","hex":"#00FFFF","group":"cyan","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":0,"y":0,"w":34,"h":100}}},{"type":"colour","width":"full","data":{"name":"Magenta","hex":"#FF00FF","group":"magenta","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":33,"y":0,"w":34,"h":100}}},{"type":"colour","width":"full","data":{"name":"Yellow","hex":"#FFFF00","group":"yellow","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":66,"y":0,"w":34,"h":100}}}]},"output":{"blocks":[{"type":"colour","width":"full","data":{"name":"Combined inks","hex":"#000000","group":"mix","role":"fill","mix":"multiply","mixFrom":"cyan,magenta,yellow","proportion":100,"channels":false,"layout":{"x":0,"y":0,"w":100,"h":100}}}]},"categories":[{"name":"Colour and Design","slug":"colour-design"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"Britannica: Color printing","url":"https://www.britannica.com/technology/color-printing","publisher":"Encyclopaedia Britannica","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":2,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["colour"],"provenance":null,"published_at":"2026-08-14 14:50:54","updated_at":"2026-08-14 19:20:09"}
{"id":106,"slug":"red-green-blue-light-makes-white","title":"Red, green and blue light can combine into white","summary":"Balanced additive primaries are perceived as white.","library":"learning","relationship_type":"produces","relationship":"Each light adds wavelengths reaching the eye. Equal full-intensity primaries sum to white. Dim any primary and the mix leaves that hue.","input":{"blocks":[{"type":"colour","width":"full","data":{"name":"Red","hex":"#FF0000","group":"red","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":0,"y":0,"w":34,"h":100}}},{"type":"colour","width":"full","data":{"name":"Green","hex":"#00FF00","group":"green","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":33,"y":0,"w":34,"h":100}}},{"type":"colour","width":"full","data":{"name":"Blue","hex":"#0000FF","group":"blue","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":66,"y":0,"w":34,"h":100}}}]},"output":{"blocks":[{"type":"colour","width":"full","data":{"name":"Added light","hex":"#FFFFFF","group":"mix","role":"fill","mix":"add","mixFrom":"red,green,blue","proportion":100,"channels":false,"layout":{"x":0,"y":0,"w":100,"h":100}}}]},"categories":[{"name":"Colour and Design","slug":"colour-design"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"Britannica: The visible spectrum","url":"https://www.britannica.com/science/color/The-visible-spectrum","publisher":"Encyclopaedia Britannica","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":2,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["colour"],"provenance":null,"published_at":"2026-08-14 14:50:54","updated_at":"2026-08-14 19:20:09"}
{"id":105,"slug":"ice-floats-in-liquid-water","title":"Ice floats because its solid structure is less dense","summary":"Hydrogen bonds hold water molecules farther apart in ordinary ice.","library":"learning","relationship_type":"causes","relationship":"Freezing arranges molecules into an open crystal lattice. The same mass occupies more volume than liquid water, so buoyancy supports the less-dense solid.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A piece of freshwater ice placed in liquid freshwater"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Ice remains partly above the liquid surface"}}]},"categories":[{"name":"Everyday Science","slug":"everyday-science"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"oceanservice.noaa.gov: Ice floats because its solid structure is less dense","url":"https://oceanservice.noaa.gov/facts/iceberg.html","publisher":"oceanservice.noaa.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:50:53","updated_at":"2026-08-14 14:50:54"}
{"id":104,"slug":"static-charge-attracts-paper","title":"A static charge attracts small paper pieces","summary":"A nearby charge rearranges charge inside otherwise neutral paper.","library":"learning","relationship_type":"causes","relationship":"The electric field shifts electrons slightly within each paper piece. The nearer side gains an induced opposite charge, creating a net attractive force.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A charged plastic comb held close to tiny neutral paper pieces"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Paper pieces lift toward and may cling to the comb"}}]},"categories":[{"name":"Everyday Science","slug":"everyday-science"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"www.britannica.com: A static charge attracts small paper pieces","url":"https://www.britannica.com/science/static-electricity","publisher":"www.britannica.com","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:50:53","updated_at":"2026-08-14 14:50:53"}
{"id":103,"slug":"iron-rusts-with-water-and-oxygen","title":"Iron rusts when water and oxygen are present","summary":"An electrochemical reaction converts exposed iron into hydrated oxides.","library":"learning","relationship_type":"produces","relationship":"Different areas of the wet metal surface act as electrochemical sites. Iron loses electrons while dissolved oxygen is reduced, producing iron oxides over time.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Unprotected iron exposed to oxygen and moisture"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A brittle reddish-brown layer of rust on the iron"}}]},"categories":[{"name":"Everyday Science","slug":"everyday-science"}],"topics":[{"name":"Chemistry","slug":"chemistry"}],"sources":[{"title":"www.britannica.com: Iron rusts when water and oxygen are present","url":"https://www.britannica.com/science/rust","publisher":"www.britannica.com","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:50:52","updated_at":"2026-08-14 14:50:53"}
{"id":102,"slug":"pressure-cooker-raises-boiling-temperature","title":"A pressure cooker raises water’s boiling temperature","summary":"Higher pressure lets cooking water become hotter before it boils.","library":"learning","relationship_type":"causes","relationship":"Steam accumulates inside the sealed vessel and raises pressure. Water must then reach a higher temperature for its vapour pressure to cause boiling.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Water and food sealed in a pressure cooker over heat"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Hotter cooking conditions and faster tenderising of many foods"}}]},"categories":[{"name":"Everyday Science","slug":"everyday-science"}],"topics":[{"name":"Cooking","slug":"cooking"}],"sources":[{"title":"www.britannica.com: A pressure cooker raises water’s boiling temperature","url":"https://www.britannica.com/technology/pressure-cooker","publisher":"www.britannica.com","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:50:52","updated_at":"2026-08-14 14:50:52"}
{"id":101,"slug":"evaporation-cools-a-wet-surface","title":"Evaporation cools a wet surface","summary":"The fastest molecules escape first and lower the average energy left behind.","library":"learning","relationship_type":"causes","relationship":"Some surface molecules have enough kinetic energy to enter the air as vapour. Their departure removes above-average energy from the remaining liquid and surface.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Liquid water spread across a warm surface with moving dry air"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A drier surface at a lower temperature than before evaporation"}}]},"categories":[{"name":"Everyday Science","slug":"everyday-science"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"www.weather.gov: Evaporation cools a wet surface","url":"https://www.weather.gov/jetstream/ll_evaporation","publisher":"www.weather.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:50:51","updated_at":"2026-08-14 14:50:52"}
{"id":100,"slug":"four-litre-water-jug","title":"Measure exactly four litres with two jugs","summary":"Repeated filling and pouring leaves a known remainder.","library":"general","relationship_type":"solves","relationship":"Fill the 5-litre jug and pour into the 3-litre jug, leaving 2 litres. Empty the smaller jug, transfer the 2 litres into it, refill the 5-litre jug, then top up the smaller jug with 1 litre.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"An unmarked 3-litre jug, an unmarked 5-litre jug and unlimited water"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Exactly 4 litres remain in the 5-litre jug"}}]},"categories":[{"name":"Puzzles and Riddles","slug":"puzzles-riddles"}],"topics":[{"name":"Logic","slug":"logic"}],"sources":[{"title":"en.wikipedia.org: Measure exactly four litres with two jugs","url":"https://en.wikipedia.org/wiki/Water_pouring_puzzle","publisher":"en.wikipedia.org","licence":"CC-BY-SA-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":99,"slug":"eight-balls-two-weighings","title":"Find one heavier ball in two weighings","summary":"A balance scale divides possibilities into three outcome groups.","library":"general","relationship_type":"solves","relationship":"Weigh three against three. If balanced, weigh the remaining two. If unbalanced, take the heavier group of three and weigh one against one.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Eight identical-looking balls with exactly one heavier ball"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"The heavier ball identified within two weighings"}}]},"categories":[{"name":"Puzzles and Riddles","slug":"puzzles-riddles"}],"topics":[{"name":"Logic","slug":"logic"}],"sources":[{"title":"en.wikipedia.org: Find one heavier ball in two weighings","url":"https://en.wikipedia.org/wiki/Balance_puzzle","publisher":"en.wikipedia.org","licence":"CC-BY-SA-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":98,"slug":"bridge-and-torch-minimum-time","title":"Cross the bridge in 17 minutes","summary":"The two fastest people shuttle the torch while the slowest cross together.","library":"general","relationship_type":"solves","relationship":"Send 1 and 2 across, 1 returns, 5 and 10 cross, 2 returns, then 1 and 2 cross again. The times are 2 + 1 + 10 + 2 + 2.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Four people taking 1, 2, 5 and 10 minutes, one torch and a two-person bridge"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Everyone crosses in 17 minutes"}}]},"categories":[{"name":"Puzzles and Riddles","slug":"puzzles-riddles"}],"topics":[{"name":"Logic","slug":"logic"}],"sources":[{"title":"en.wikipedia.org: Cross the bridge in 17 minutes","url":"https://en.wikipedia.org/wiki/Bridge_and_torch_problem","publisher":"en.wikipedia.org","licence":"CC-BY-SA-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":97,"slug":"three-mislabeled-boxes","title":"Correct three mislabeled fruit boxes with one sample","summary":"A guaranteed-wrong label identifies the most informative box.","library":"general","relationship_type":"solves","relationship":"Take one fruit from the box labelled Mixed. Its fruit identifies that single-fruit box. The remaining wrong-label constraints determine the other two.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Boxes labelled Apples, Oranges and Mixed, with every label wrong"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"All three boxes correctly labelled"}}]},"categories":[{"name":"Puzzles and Riddles","slug":"puzzles-riddles"}],"topics":[{"name":"Logic","slug":"logic"}],"sources":[{"title":"en.wikipedia.org: Correct three mislabeled fruit boxes with one sample","url":"https://en.wikipedia.org/wiki/Induction_puzzles","publisher":"en.wikipedia.org","licence":"CC-BY-SA-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":96,"slug":"two-ropes-measure-45-minutes","title":"Measure 45 minutes with two uneven-burning ropes","summary":"Burning from both ends halves a ropes remaining burn time regardless of uneven rate.","library":"general","relationship_type":"solves","relationship":"Light rope one at both ends and rope two at one end. When rope one finishes after 30 minutes, light the other end of rope two. Its remainder burns in 15 minutes.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Two ropes that each take 60 minutes to burn but burn unevenly"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Exactly 45 minutes measured"}}]},"categories":[{"name":"Puzzles and Riddles","slug":"puzzles-riddles"}],"topics":[{"name":"Logic","slug":"logic"}],"sources":[{"title":"en.wikipedia.org: Measure 45 minutes with two uneven-burning ropes","url":"https://en.wikipedia.org/wiki/Rope-burning_puzzle","publisher":"en.wikipedia.org","licence":"CC-BY-SA-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":95,"slug":"why-stars-twinkle","title":"Why do stars twinkle?","summary":"Moving air bends narrow starlight paths by changing amounts.","library":"general","relationship_type":"answers","relationship":"Turbulent layers with different temperature and density continually alter refraction, making the apparent brightness and position fluctuate.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Light from a distant star passing through Earths atmosphere"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A star that appears to shimmer"}}]},"categories":[{"name":"Questions and Answers","slug":"questions-answers"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"science.nasa.gov: Why do stars twinkle?","url":"https://science.nasa.gov/mission/hubble/overview/why-have-a-telescope-in-space/","publisher":"science.nasa.gov","licence":"US-PUBLIC-DOMAIN"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":94,"slug":"why-echo-returns","title":"Why does an echo return?","summary":"A sound wave reflects from a distant surface and arrives later.","library":"general","relationship_type":"answers","relationship":"Part of the pressure wave bounces back. If the travel delay is long enough, the reflected sound is heard separately.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A short sound made near a large hard surface"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A delayed repetition of the original sound"}}]},"categories":[{"name":"Questions and Answers","slug":"questions-answers"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"www.noaa.gov: Why does an echo return?","url":"https://www.noaa.gov/jetstream/sound","publisher":"www.noaa.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":93,"slug":"why-earth-has-seasons","title":"Why does Earth have seasons?","summary":"Axial tilt changes sunlight angle and day length through the orbit.","library":"general","relationship_type":"answers","relationship":"Each hemisphere alternately tilts toward and away from the Sun, changing both solar intensity and hours of daylight.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Earth orbiting the Sun with its axis tilted about 23.5 degrees"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Opposite seasonal cycles in the northern and southern hemispheres"}}]},"categories":[{"name":"Questions and Answers","slug":"questions-answers"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"spaceplace.nasa.gov: Why does Earth have seasons?","url":"https://spaceplace.nasa.gov/seasons/en/","publisher":"spaceplace.nasa.gov","licence":"US-PUBLIC-DOMAIN"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":92,"slug":"why-ocean-has-tides","title":"Why do oceans have tides?","summary":"Differences in gravitational pull stretch ocean water into broad bulges.","library":"general","relationship_type":"answers","relationship":"The Moon provides the strongest tidal influence, while the Sun modifies it. Earth rotating through the bulges produces local water-level cycles.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Earth, its oceans, the Moon and the Sun"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Predictable rises and falls in coastal water level"}}]},"categories":[{"name":"Questions and Answers","slug":"questions-answers"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"oceanservice.noaa.gov: Why do oceans have tides?","url":"https://oceanservice.noaa.gov/education/tutorial_tides/","publisher":"oceanservice.noaa.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":91,"slug":"why-moon-has-phases","title":"Why does the Moon have phases?","summary":"Our viewing angle changes how much of its sunlit half we see.","library":"general","relationship_type":"answers","relationship":"As the Moon moves around Earth, the visible fraction of its illuminated hemisphere changes.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"The Moon orbiting Earth while the Sun lights half of it"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A repeating sequence from new Moon through full Moon and back"}}]},"categories":[{"name":"Questions and Answers","slug":"questions-answers"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"science.nasa.gov: Why does the Moon have phases?","url":"https://science.nasa.gov/moon/moon-phases/","publisher":"science.nasa.gov","licence":"US-PUBLIC-DOMAIN"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":90,"slug":"why-leaves-look-green","title":"Why do many leaves look green?","summary":"Chlorophyll absorbs red and blue light more strongly than green light.","library":"general","relationship_type":"answers","relationship":"Photosynthetic pigments absorb selected wavelengths for energy transfer. More green light is reflected or transmitted to the eye.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"White sunlight falling on a healthy leaf"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"The leaf appears predominantly green"}}]},"categories":[{"name":"Questions and Answers","slug":"questions-answers"}],"topics":[{"name":"Biology","slug":"biology"}],"sources":[{"title":"science.nasa.gov: Why do many leaves look green?","url":"https://science.nasa.gov/ems/09_visiblelight/","publisher":"science.nasa.gov","licence":"US-PUBLIC-DOMAIN"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":89,"slug":"public-good-creates-free-rider-incentive","title":"A public good creates a free-rider incentive","summary":"People can benefit even when they do not contribute directly.","library":"learning","relationship_type":"causes","relationship":"Because access cannot easily be withheld, each person may prefer others to bear the cost while still receiving the benefit.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A non-excludable service funded by voluntary contributions"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Underfunding relative to the shared demand for the service"}}]},"categories":[{"name":"Society and Systems","slug":"society-systems"}],"topics":[{"name":"Communication","slug":"communication"}],"sources":[{"title":"openstax.org: A public good creates a free-rider incentive","url":"https://openstax.org/books/principles-economics-3e/pages/13-3-public-goods","publisher":"openstax.org","licence":"CC-BY-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":88,"slug":"progressive-tax-changes-after-tax-distribution","title":"Progressive tax rates change after-tax income distribution","summary":"Higher portions of income face higher marginal rates.","library":"learning","relationship_type":"transforms","relationship":"Tax is calculated in brackets, so higher incomes pay a larger share on upper portions rather than one rate on every unit.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Households with different taxable incomes under a progressive schedule"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"After-tax incomes with a narrower proportional spread than before tax"}}]},"categories":[{"name":"Society and Systems","slug":"society-systems"}],"topics":[{"name":"Communication","slug":"communication"}],"sources":[{"title":"www.oecd.org: Progressive tax rates change after-tax income distribution","url":"https://www.oecd.org/tax/tax-policy/taxing-wages-brochure.pdf","publisher":"www.oecd.org","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":87,"slug":"inflation-reduces-purchasing-power","title":"Inflation reduces the purchasing power of unchanged money","summary":"A general rise in prices means each currency unit buys fewer goods and services.","library":"learning","relationship_type":"causes","relationship":"The same nominal amount must cover higher prices across the basket of purchases.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Income held constant while the consumer price level rises"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A lower quantity of goods and services affordable with that income"}}]},"categories":[{"name":"Society and Systems","slug":"society-systems"}],"topics":[{"name":"Communication","slug":"communication"}],"sources":[{"title":"www.bls.gov: Inflation reduces the purchasing power of unchanged money","url":"https://www.bls.gov/cpi/questions-and-answers.htm","publisher":"www.bls.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":86,"slug":"peer-review-challenges-research","title":"Peer review challenges a research manuscript","summary":"Independent specialists examine methods, evidence and claims before publication.","library":"learning","relationship_type":"transforms","relationship":"Editors select reviewers who identify weaknesses, request clarification and recommend acceptance, revision or rejection.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A manuscript submitted to a scholarly journal"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A decision and often a revised, more defensible manuscript"}}]},"categories":[{"name":"Society and Systems","slug":"society-systems"}],"topics":[{"name":"Communication","slug":"communication"}],"sources":[{"title":"www.ncbi.nlm.nih.gov: Peer review challenges a research manuscript","url":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4975196/","publisher":"www.ncbi.nlm.nih.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":85,"slug":"vaccination-reduces-transmission-opportunities","title":"Vaccination can reduce transmission opportunities","summary":"Fewer susceptible hosts make chains of infection harder to sustain.","library":"learning","relationship_type":"causes","relationship":"When exposure is less likely to produce an onward infection, more transmission chains end before reaching vulnerable people.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A population with a high share of people effectively immunised"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Lower community spread for diseases and vaccines where transmission is reduced"}}]},"categories":[{"name":"Society and Systems","slug":"society-systems"}],"topics":[{"name":"Biology","slug":"biology"}],"sources":[{"title":"www.who.int: Vaccination can reduce transmission opportunities","url":"https://www.who.int/news-room/questions-and-answers/item/herd-immunity-lockdowns-and-covid-19","publisher":"www.who.int","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":84,"slug":"fifo-queue-preserves-arrival-order","title":"A FIFO queue preserves arrival order","summary":"The earliest accepted item is removed first.","library":"learning","relationship_type":"transforms","relationship":"Each item joins at the back. Removal always occurs at the front.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Items A, B and C entering an empty queue in that order"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Items leave in the order A, B, C"}}]},"categories":[{"name":"Society and Systems","slug":"society-systems"}],"topics":[{"name":"Communication","slug":"communication"}],"sources":[{"title":"xlinux.nist.gov: A FIFO queue preserves arrival order","url":"https://xlinux.nist.gov/dads/HTML/queue.html","publisher":"xlinux.nist.gov","licence":"US-PUBLIC-DOMAIN"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":83,"slug":"specific-email-subject-improves-triage","title":"A specific email subject improves triage","summary":"A concise label exposes topic and requested action before opening.","library":"learning","relationship_type":"causes","relationship":"The recipient can classify urgency and route the message using information visible in the inbox.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"An email subject naming the project, decision and due date"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Faster prioritisation and a clearer expectation"}}]},"categories":[{"name":"Society and Systems","slug":"society-systems"}],"topics":[{"name":"Communication","slug":"communication"}],"sources":[{"title":"owl.purdue.edu: A specific email subject improves triage","url":"https://owl.purdue.edu/owl/general_writing/academic_writing/email_etiquette.html","publisher":"owl.purdue.edu","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":82,"slug":"spaced-practice-improves-recall","title":"Spaced practice improves later recall","summary":"Retrieval distributed over time strengthens access to learned material.","library":"learning","relationship_type":"causes","relationship":"Each delayed retrieval requires reconstructing the memory. Repetition after partial forgetting reinforces useful retrieval pathways.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Several short study sessions separated across days"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Better long-term recall than the same practice massed into one session"}}]},"categories":[{"name":"Society and Systems","slug":"society-systems"}],"topics":[{"name":"Communication","slug":"communication"}],"sources":[{"title":"ies.ed.gov: Spaced practice improves later recall","url":"https://ies.ed.gov/ncee/wwc/PracticeGuide/1","publisher":"ies.ed.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":81,"slug":"direct-pressure-controls-bleeding","title":"Direct pressure helps control external bleeding","summary":"Firm pressure supports clot formation and reduces blood flow from the wound.","library":"learning","relationship_type":"causes","relationship":"Apply steady, firm pressure without repeatedly lifting the dressing to inspect it. Follow local emergency guidance for severe bleeding.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A bleeding wound covered with clean material while emergency help is sought"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Reduced external blood loss while awaiting further care"}}]},"categories":[{"name":"Practical Skills","slug":"practical-skills"}],"topics":[{"name":"Biology","slug":"biology"}],"sources":[{"title":"www.redcross.org: Direct pressure helps control external bleeding","url":"https://www.redcross.org/take-a-class/first-aid/performing-first-aid/first-aid-steps","publisher":"www.redcross.org","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":80,"slug":"pilot-hole-prevents-splitting","title":"A pilot hole helps prevent wood splitting","summary":"Removing a narrow core reduces outward stress from the screw.","library":"learning","relationship_type":"causes","relationship":"Drill a hole slightly smaller than the screw body before driving. The screw threads still grip while displacing less material.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A screw driven near the edge of a wooden board"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A seated screw with lower risk of a split board"}}]},"categories":[{"name":"Practical Skills","slug":"practical-skills"}],"topics":[{"name":"Practical Skills","slug":"practical-skills"}],"sources":[{"title":"www.fpl.fs.usda.gov: A pilot hole helps prevent wood splitting","url":"https://www.fpl.fs.usda.gov/documnts/fplgtr/fpl_gtr190.pdf","publisher":"www.fpl.fs.usda.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":79,"slug":"boiling-water-kills-pathogens","title":"Boiling makes microbiologically unsafe water safer","summary":"Sustained high temperature inactivates disease-causing organisms.","library":"learning","relationship_type":"causes","relationship":"Heat damages essential proteins and membranes in bacteria, viruses and parasites. Chemical contamination is not removed.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Clear water brought to a rolling boil"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Water with greatly reduced biological risk after cooling safely"}}]},"categories":[{"name":"Practical Skills","slug":"practical-skills"}],"topics":[{"name":"Biology","slug":"biology"}],"sources":[{"title":"www.cdc.gov: Boiling makes microbiologically unsafe water safer","url":"https://www.cdc.gov/healthy-water-emergency/about/index.html","publisher":"www.cdc.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":78,"slug":"refrigeration-slows-food-spoilage","title":"Refrigeration slows food spoilage","summary":"Lower temperature slows microbial growth and chemical reactions.","library":"learning","relationship_type":"causes","relationship":"Cold conditions reduce the rate at which many microorganisms multiply, though they do not sterilise the food.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Perishable food moved promptly into a refrigerator at 4 C or below"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Food that remains safe and usable for longer within storage guidance"}}]},"categories":[{"name":"Practical Skills","slug":"practical-skills"}],"topics":[{"name":"Cooking","slug":"cooking"}],"sources":[{"title":"www.fsis.usda.gov: Refrigeration slows food spoilage","url":"https://www.fsis.usda.gov/food-safety/safe-food-handling-and-preparation/food-safety-basics/refrigeration","publisher":"www.fsis.usda.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":77,"slug":"bowline-forms-fixed-loop","title":"A bowline forms a fixed loop","summary":"The rope path locks around its standing part without a sliding noose.","library":"learning","relationship_type":"transforms","relationship":"Form a small loop, pass the working end through it, around the standing part and back through the first loop, then dress and tighten the knot.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"One rope end and a required loop size"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A fixed loop that does not tighten under normal load"}}]},"categories":[{"name":"Practical Skills","slug":"practical-skills"}],"topics":[{"name":"Practical Skills","slug":"practical-skills"}],"sources":[{"title":"www.animatedknots.com: A bowline forms a fixed loop","url":"https://www.animatedknots.com/bowline-knot","publisher":"www.animatedknots.com","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":76,"slug":"measure-twice-reduces-cutting-error","title":"A second measurement reduces cutting errors","summary":"Independent checking catches reading and marking mistakes before an irreversible step.","library":"learning","relationship_type":"causes","relationship":"Measure the intended dimension again from the same reference edge and compare it with the mark before cutting.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A board marked for a single final cut"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A cut more likely to match the required dimension"}}]},"categories":[{"name":"Practical Skills","slug":"practical-skills"}],"topics":[{"name":"Geometry","slug":"geometry"}],"sources":[{"title":"www.nist.gov: A second measurement reduces cutting errors","url":"https://www.nist.gov/pml/owm/si-units-length","publisher":"www.nist.gov","licence":"US-PUBLIC-DOMAIN"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":75,"slug":"cross-ventilation-moves-air","title":"Openings on opposite sides create cross-ventilation","summary":"Pressure differences drive air through the room.","library":"learning","relationship_type":"causes","relationship":"Wind and temperature differences create a pressure gradient. Air enters one opening and exits the other.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Two open windows on different sides of a room"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A sustained path of moving indoor air"}}]},"categories":[{"name":"Practical Skills","slug":"practical-skills"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"www.epa.gov: Openings on opposite sides create cross-ventilation","url":"https://www.epa.gov/indoor-air-quality-iaq/improving-indoor-air-quality","publisher":"www.epa.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":74,"slug":"mise-en-place-reduces-errors","title":"Mise en place reduces cooking mistakes","summary":"Preparing ingredients first moves checks before time-critical cooking.","library":"learning","relationship_type":"causes","relationship":"The cook confirms quantities and sequence before heat or timing pressure begins.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A recipe, measured ingredients and prepared tools"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A smoother cooking process with fewer missing ingredients"}}]},"categories":[{"name":"Practical Skills","slug":"practical-skills"}],"topics":[{"name":"Cooking","slug":"cooking"}],"sources":[{"title":"www.ciachef.edu: Mise en place reduces cooking mistakes","url":"https://www.ciachef.edu/blog/10-valuable-lessons-i-learned-in-culinary-school/","publisher":"www.ciachef.edu","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":73,"slug":"resting-dough-relaxes-gluten","title":"Resting dough makes it easier to shape","summary":"Time allows hydration and reduces elastic resistance in the gluten network.","library":"learning","relationship_type":"causes","relationship":"Water continues moving into flour components while stressed gluten strands relax.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Mixed wheat dough covered and left undisturbed"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Smoother dough that stretches with less spring-back"}}]},"categories":[{"name":"Practical Skills","slug":"practical-skills"}],"topics":[{"name":"Cooking","slug":"cooking"}],"sources":[{"title":"www.kingarthurbaking.com: Resting dough makes it easier to shape","url":"https://www.kingarthurbaking.com/learn/guides/yeast-baking","publisher":"www.kingarthurbaking.com","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":72,"slug":"preheating-stabilises-baking","title":"Preheating makes baking conditions predictable","summary":"The oven walls and air reach the target temperature before food enters.","library":"learning","relationship_type":"causes","relationship":"Waiting through the preheat cycle lets the heating system and interior surfaces approach a stable operating range.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A cold oven set to the recipe temperature"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Food begins cooking near the intended temperature"}}]},"categories":[{"name":"Practical Skills","slug":"practical-skills"}],"topics":[{"name":"Cooking","slug":"cooking"}],"sources":[{"title":"www.fsis.usda.gov: Preheating makes baking conditions predictable","url":"https://www.fsis.usda.gov/food-safety/safe-food-handling-and-preparation/food-safety-basics","publisher":"www.fsis.usda.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":71,"slug":"api-object-to-json","title":"An API serialises an object as JSON","summary":"Named values and arrays are encoded into a language-neutral text format.","library":"learning","relationship_type":"transforms","relationship":"The serializer escapes strings, preserves supported scalar values and emits nested objects and arrays using JSON syntax.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A server-side record object"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A UTF-8 JSON response a client can parse"}}]},"categories":[{"name":"Technology","slug":"technology"}],"topics":[{"name":"Computing","slug":"computing"}],"sources":[{"title":"www.rfc-editor.org: An API serialises an object as JSON","url":"https://www.rfc-editor.org/rfc/rfc8259","publisher":"www.rfc-editor.org","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":70,"slug":"service-worker-offline-page","title":"A service worker can serve a page offline","summary":"A programmable network layer responds from a cache when the network fails.","library":"learning","relationship_type":"transforms","relationship":"The service worker intercepts the navigation, attempts the network and falls back to a matching cached response or offline shell.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A previously cached public record opened without connectivity"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Readable cached content without a live connection"}}]},"categories":[{"name":"Technology","slug":"technology"}],"topics":[{"name":"Computing","slug":"computing"}],"sources":[{"title":"developer.mozilla.org: A service worker can serve a page offline","url":"https://developer.mozilla.org/en-US/docs/Web/API/Service_Worker_API/Using_Service_Workers","publisher":"developer.mozilla.org","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":69,"slug":"responsive-image-selects-source","title":"Responsive images select an efficient source","summary":"The browser combines candidate metadata with layout and device conditions.","library":"learning","relationship_type":"transforms","relationship":"Before fetching, the browser estimates the rendered width and pixel density, then chooses an appropriate candidate.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"An image element with srcset and sizes candidates"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A suitably sized image for the current display"}}]},"categories":[{"name":"Technology","slug":"technology"}],"topics":[{"name":"Computing","slug":"computing"}],"sources":[{"title":"developer.mozilla.org: Responsive images select an efficient source","url":"https://developer.mozilla.org/en-US/docs/Learn/HTML/Multimedia_and_embedding/Responsive_images","publisher":"developer.mozilla.org","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":68,"slug":"dns-name-to-address","title":"DNS turns a domain name into an address","summary":"Resolvers follow cached or delegated records to find an answer.","library":"learning","relationship_type":"transforms","relationship":"The resolver checks caches and, when needed, queries the DNS hierarchy until it obtains an address record.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A browser needing the address for example.com"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"An IP address the browser can connect to"}}]},"categories":[{"name":"Technology","slug":"technology"}],"topics":[{"name":"Computing","slug":"computing"}],"sources":[{"title":"developers.cloudflare.com: DNS turns a domain name into an address","url":"https://developers.cloudflare.com/learning-paths/cybersafe/concepts/what-is-dns/","publisher":"developers.cloudflare.com","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":67,"slug":"git-commit-records-snapshot","title":"A Git commit records a project snapshot","summary":"Content hashes and metadata connect a new state to its parent.","library":"learning","relationship_type":"transforms","relationship":"Git stores content objects, a tree describing the project state and a commit object that references the tree and previous history.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Staged file changes and a commit message"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"An immutable commit identifier in the repository graph"}}]},"categories":[{"name":"Technology","slug":"technology"}],"topics":[{"name":"Computing","slug":"computing"}],"sources":[{"title":"git-scm.com: A Git commit records a project snapshot","url":"https://git-scm.com/book/en/v2/Git-Internals-Git-Objects","publisher":"git-scm.com","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":66,"slug":"analogue-sensor-to-digital-value","title":"An analogue sensor becomes a digital reading","summary":"Sampling and quantisation map voltage into numbered levels.","library":"learning","relationship_type":"transforms","relationship":"An analogue-to-digital converter samples the voltage and assigns the nearest representable code for its bit depth and reference range.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A sensor producing a voltage between 0 and 3.3 volts"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"An integer that software can process"}}]},"categories":[{"name":"Technology","slug":"technology"}],"topics":[{"name":"Computing","slug":"computing"}],"sources":[{"title":"www.nist.gov: An analogue sensor becomes a digital reading","url":"https://www.nist.gov/sensors","publisher":"www.nist.gov","licence":"US-PUBLIC-DOMAIN"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":65,"slug":"qr-code-opens-url","title":"A QR code carries a URL into a phone","summary":"A two-dimensional pattern encodes characters with error correction.","library":"learning","relationship_type":"transforms","relationship":"The scanner locates alignment patterns, samples the grid, corrects recoverable errors and decodes the character payload.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A URL encoded as a QR symbol and scanned by a camera"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"The decoded URL offered to the user"}}]},"categories":[{"name":"Technology","slug":"technology"}],"topics":[{"name":"Computing","slug":"computing"}],"sources":[{"title":"www.iso.org: A QR code carries a URL into a phone","url":"https://www.iso.org/standard/62021.html","publisher":"www.iso.org","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":64,"slug":"http-cache-reuses-response","title":"HTTP caching makes repeat visits faster","summary":"A fresh stored response can satisfy a later request locally or at the edge.","library":"learning","relationship_type":"causes","relationship":"Cache rules allow reuse of the stored bytes without downloading the full resource. Validation can also confirm freshness with a small conditional request.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A browser requesting an unchanged versioned asset again"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Lower latency and fewer transferred bytes"}}]},"categories":[{"name":"Technology","slug":"technology"}],"topics":[{"name":"Computing","slug":"computing"}],"sources":[{"title":"developer.mozilla.org: HTTP caching makes repeat visits faster","url":"https://developer.mozilla.org/en-US/docs/Web/HTTP/Caching","publisher":"developer.mozilla.org","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":63,"slug":"database-index-speeds-lookup","title":"A database index speeds selective lookups","summary":"An ordered auxiliary structure avoids scanning every row.","library":"learning","relationship_type":"causes","relationship":"The database traverses the index to locate matching row references, then reads only the required records.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A query filtering a large table by an indexed column"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Fewer examined rows and a faster query"}}]},"categories":[{"name":"Technology","slug":"technology"}],"topics":[{"name":"Computing","slug":"computing"}],"sources":[{"title":"dev.mysql.com: A database index speeds selective lookups","url":"https://dev.mysql.com/doc/refman/8.4/en/mysql-indexes.html","publisher":"dev.mysql.com","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":62,"slug":"tls-protects-web-traffic","title":"TLS turns readable web traffic into protected records","summary":"A handshake establishes authenticated encryption keys.","library":"learning","relationship_type":"transforms","relationship":"The endpoints negotiate algorithms, validate the server certificate and derive shared session keys. Application data is then encrypted and authenticated.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A browser connecting to an HTTPS server"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Confidential, tamper-evident traffic between browser and server"}}]},"categories":[{"name":"Technology","slug":"technology"}],"topics":[{"name":"Computing","slug":"computing"}],"sources":[{"title":"developer.mozilla.org: TLS turns readable web traffic into protected records","url":"https://developer.mozilla.org/en-US/docs/Web/Security/Transport_Layer_Security","publisher":"developer.mozilla.org","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":61,"slug":"lossless-compression-restores-original","title":"Lossless compression reduces data without losing content","summary":"Repeated patterns are represented more efficiently.","library":"learning","relationship_type":"transforms","relationship":"The compressor replaces predictable structures with shorter references and metadata. The decoder reverses those mappings exactly.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A file containing recurring byte sequences"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A smaller encoded file that restores the original bytes"}}]},"categories":[{"name":"Technology","slug":"technology"}],"topics":[{"name":"Computing","slug":"computing"}],"sources":[{"title":"www.loc.gov: Lossless compression reduces data without losing content","url":"https://www.loc.gov/preservation/digital/formats/fdd/fdd000138.shtml","publisher":"www.loc.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":60,"slug":"hash-input-to-digest","title":"A hash function turns input into a fixed-length digest","summary":"A deterministic algorithm mixes input bits into a compact fingerprint.","library":"learning","relationship_type":"transforms","relationship":"A cryptographic hash processes the byte sequence through repeated nonlinear operations. Even a small input change produces a substantially different digest.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"The UTF-8 text The Results Library"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A fixed-length hexadecimal digest"}}]},"categories":[{"name":"Technology","slug":"technology"}],"topics":[{"name":"Computing","slug":"computing"}],"sources":[{"title":"csrc.nist.gov: A hash function turns input into a fixed-length digest","url":"https://csrc.nist.gov/Projects/hash-functions","publisher":"csrc.nist.gov","licence":"US-PUBLIC-DOMAIN"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":59,"slug":"slope-between-two-points","title":"Find the slope between two points","summary":"Slope divides vertical change by horizontal change.","library":"learning","relationship_type":"solves","relationship":"The vertical change is 8 and the horizontal change is 4. Divide 8 by 4.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Points (2, 3) and (6, 11)"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A slope of 2"}}]},"categories":[{"name":"Mathematics","slug":"mathematics"}],"topics":[{"name":"Geometry","slug":"geometry"}],"sources":[{"title":"mathworld.wolfram.com: Find the slope between two points","url":"https://mathworld.wolfram.com/Slope.html","publisher":"mathworld.wolfram.com","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":58,"slug":"compound-growth-two-years","title":"Compound 10 percent growth for two years","summary":"Each period applies growth to the previous result.","library":"learning","relationship_type":"solves","relationship":"Multiply by 1.10 for the first year and again for the second year.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A starting value of 100 growing by 10 percent each year"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A value of 121 after two years"}}]},"categories":[{"name":"Mathematics","slug":"mathematics"}],"topics":[{"name":"Geometry","slug":"geometry"}],"sources":[{"title":"www.investor.gov: Compound 10 percent growth for two years","url":"https://www.investor.gov/financial-tools-calculators/calculators/compound-interest-calculator","publisher":"www.investor.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":57,"slug":"cube-volume","title":"Find the volume of a cube","summary":"Three equal dimensions multiply.","library":"learning","relationship_type":"solves","relationship":"Multiply length x width x height: 4 x 4 x 4.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A cube with edge length 4 centimetres"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A volume of 64 cubic centimetres"}}]},"categories":[{"name":"Mathematics","slug":"mathematics"}],"topics":[{"name":"Geometry","slug":"geometry"}],"sources":[{"title":"mathworld.wolfram.com: Find the volume of a cube","url":"https://mathworld.wolfram.com/Cube.html","publisher":"mathworld.wolfram.com","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":56,"slug":"rectangle-perimeter","title":"Find the perimeter of a rectangle","summary":"Perimeter adds all boundary lengths.","library":"learning","relationship_type":"solves","relationship":"Add two lengths and two widths: 8 + 3 + 8 + 3.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A rectangle 8 units long and 3 units wide"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A perimeter of 22 units"}}]},"categories":[{"name":"Mathematics","slug":"mathematics"}],"topics":[{"name":"Geometry","slug":"geometry"}],"sources":[{"title":"mathworld.wolfram.com: Find the perimeter of a rectangle","url":"https://mathworld.wolfram.com/Rectangle.html","publisher":"mathworld.wolfram.com","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":55,"slug":"kilometres-to-metres","title":"Convert 2.4 kilometres to metres","summary":"The metric prefix kilo represents one thousand.","library":"learning","relationship_type":"transforms","relationship":"Multiply 2.4 by 1,000 metres per kilometre.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A distance of 2.4 kilometres"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A distance of 2,400 metres"}}]},"categories":[{"name":"Mathematics","slug":"mathematics"}],"topics":[{"name":"Geometry","slug":"geometry"}],"sources":[{"title":"www.nist.gov: Convert 2.4 kilometres to metres","url":"https://www.nist.gov/pml/owm/si-units-length","publisher":"www.nist.gov","licence":"US-PUBLIC-DOMAIN"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":54,"slug":"fair-coin-two-heads-probability","title":"Find the probability of two heads","summary":"Independent outcomes multiply.","library":"learning","relationship_type":"solves","relationship":"Each toss has a one-half chance of heads. Multiply one-half by one-half.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A fair coin tossed twice"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A probability of one quarter"}}]},"categories":[{"name":"Mathematics","slug":"mathematics"}],"topics":[{"name":"Geometry","slug":"geometry"}],"sources":[{"title":"www.itl.nist.gov: Find the probability of two heads","url":"https://www.itl.nist.gov/div898/handbook/eda/section3/eda366.htm","publisher":"www.itl.nist.gov","licence":"US-PUBLIC-DOMAIN"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":53,"slug":"median-of-seven-values","title":"Find the median of seven values","summary":"Ordering identifies the central observation.","library":"learning","relationship_type":"solves","relationship":"Order them as 2, 3, 4, 6, 7, 9, 11. The fourth value has three observations on each side.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Values 9, 2, 6, 4, 11, 7 and 3"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A median of 6"}}]},"categories":[{"name":"Mathematics","slug":"mathematics"}],"topics":[{"name":"Geometry","slug":"geometry"}],"sources":[{"title":"www.itl.nist.gov: Find the median of seven values","url":"https://www.itl.nist.gov/div898/handbook/eda/section3/eda351.htm","publisher":"www.itl.nist.gov","licence":"US-PUBLIC-DOMAIN"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":52,"slug":"add-one-third-one-sixth","title":"Add one third and one sixth","summary":"A common denominator makes the parts comparable.","library":"learning","relationship_type":"solves","relationship":"Rewrite 1/3 as 2/6, then add the numerators while keeping the denominator.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Fractions 1/3 and 1/6"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"3/6, simplified to 1/2"}}]},"categories":[{"name":"Mathematics","slug":"mathematics"}],"topics":[{"name":"Geometry","slug":"geometry"}],"sources":[{"title":"openstax.org: Add one third and one sixth","url":"https://openstax.org/books/prealgebra-2e/pages/4-4-add-and-subtract-fractions-with-common-denominators","publisher":"openstax.org","licence":"CC-BY-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":51,"slug":"solve-linear-equation-3x-plus-5","title":"Solve 3x + 5 = 20","summary":"Inverse operations isolate the unknown.","library":"learning","relationship_type":"solves","relationship":"Subtract 5 from both sides to get 3x = 15, then divide both sides by 3.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Equation 3x + 5 = 20"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"The solution is x = 5"}}]},"categories":[{"name":"Mathematics","slug":"mathematics"}],"topics":[{"name":"Geometry","slug":"geometry"}],"sources":[{"title":"openstax.org: Solve 3x + 5 = 20","url":"https://openstax.org/books/elementary-algebra-2e/pages/2-2-solve-equations-using-the-division-and-multiplication-properties-of-equality","publisher":"openstax.org","licence":"CC-BY-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":50,"slug":"simple-interest-example","title":"Calculate one year of simple interest","summary":"Principal, rate and time multiply directly.","library":"learning","relationship_type":"solves","relationship":"Use interest = principal x rate x time: 1,000 x 0.05 x 1.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A principal of 1,000 at 5 percent for one year"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Interest of 50 and a balance of 1,050"}}]},"categories":[{"name":"Mathematics","slug":"mathematics"}],"topics":[{"name":"Geometry","slug":"geometry"}],"sources":[{"title":"www.investor.gov: Calculate one year of simple interest","url":"https://www.investor.gov/introduction-investing/investing-basics/glossary/compound-interest","publisher":"www.investor.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":49,"slug":"pythagorean-3-4-5","title":"A 3-4-5 triangle has a right angle","summary":"The side lengths satisfy the Pythagorean equation.","library":"learning","relationship_type":"demonstrates","relationship":"Square the shorter sides: 9 + 16 = 25. This equals the square of the longest side.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A triangle with side lengths 3, 4 and 5"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"The angle opposite the side of length 5 is 90 degrees"}}]},"categories":[{"name":"Mathematics","slug":"mathematics"}],"topics":[{"name":"Geometry","slug":"geometry"}],"sources":[{"title":"mathworld.wolfram.com: A 3-4-5 triangle has a right angle","url":"https://mathworld.wolfram.com/PythagoreanTheorem.html","publisher":"mathworld.wolfram.com","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":48,"slug":"percentage-increase-80-to-100","title":"Find the percentage increase from 80 to 100","summary":"The increase is measured relative to the starting value.","library":"learning","relationship_type":"solves","relationship":"Subtract to get an increase of 20, divide 20 by the original 80, then multiply by 100.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A value changing from 80 to 100"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A 25 percent increase"}}]},"categories":[{"name":"Mathematics","slug":"mathematics"}],"topics":[{"name":"Geometry","slug":"geometry"}],"sources":[{"title":"openstax.org: Find the percentage increase from 80 to 100","url":"https://openstax.org/books/prealgebra-2e/pages/6-2-solve-general-applications-of-percent","publisher":"openstax.org","licence":"CC-BY-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":47,"slug":"contrast-ratio-supports-readable-text","title":"Contrast ratio helps predict text readability","summary":"Relative luminance compares foreground and background brightness.","library":"learning","relationship_type":"demonstrates","relationship":"WCAG contrast divides the lighter relative luminance by the darker one, after adding 0.05. Change the pickers to test other pairings.","input":{"blocks":[{"type":"colour","width":"full","data":{"name":"Background","hex":"#FFFFFF","group":"bg","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":0,"y":0,"w":100,"h":100}}},{"type":"colour","width":"full","data":{"name":"Text colour","hex":"#0B1220","group":"fg","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":18,"y":28,"w":64,"h":28}}}]},"output":{"blocks":[{"type":"colour","width":"full","data":{"name":"Contrast ratio","hex":"#0B1220","group":"ratio","role":"fill","mix":"contrast","mixFrom":"fg,bg","proportion":100,"channels":false,"layout":{"x":18,"y":28,"w":64,"h":44}}},{"type":"text","width":"full","data":{"text":"A ratio of 4.5:1 or higher supports normal text under WCAG 2.2.","layout":{"x":8,"y":78,"w":84,"h":18}}}]},"categories":[{"name":"Colour and Design","slug":"colour-design"}],"topics":[{"name":"Computing","slug":"computing"},{"name":"Physics","slug":"physics"}],"sources":[{"title":"WCAG 2.2: Contrast (Minimum)","url":"https://www.w3.org/WAI/WCAG22/Understanding/contrast-minimum.html","publisher":"W3C WAI","licence":"CC-BY-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":2,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["colour","text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 19:20:09"}
{"id":46,"slug":"alpha-compositing-result","title":"Opacity blends a foreground with its background","summary":"Alpha compositing weights foreground and background colour values.","library":"learning","relationship_type":"transforms","relationship":"Each output channel combines 50 percent of the foreground with 50 percent of the background. Change either colour; the composite follows.","input":{"blocks":[{"type":"colour","width":"full","data":{"name":"Background","hex":"#FFFFFF","group":"bg","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":0,"y":0,"w":100,"h":100}}},{"type":"colour","width":"full","data":{"name":"Foreground","hex":"#000000","group":"fg","role":"fill","mix":"","mixFrom":"","proportion":50,"channels":false,"layout":{"x":18,"y":18,"w":64,"h":64}}}]},"output":{"blocks":[{"type":"colour","width":"full","data":{"name":"Composite","hex":"#808080","group":"mix","role":"fill","mix":"over","mixFrom":"fg,bg","proportion":50,"channels":false,"layout":{"x":0,"y":0,"w":100,"h":100}}}]},"categories":[{"name":"Colour and Design","slug":"colour-design"}],"topics":[{"name":"Computing","slug":"computing"},{"name":"Physics","slug":"physics"}],"sources":[{"title":"W3C Compositing and Blending Level 1","url":"https://www.w3.org/TR/compositing-1/","publisher":"W3C","licence":"CC-BY-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":2,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["colour"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 19:20:09"}
{"id":45,"slug":"hex-19c3e6-to-rgb","title":"Convert #19C3E6 into RGB values","summary":"Each hexadecimal pair is one eight-bit colour channel.","library":"learning","relationship_type":"transforms","relationship":"19, C3 and E6 convert from base sixteen to base ten. Change the picker; the RGB channels follow the selected colour.","input":{"blocks":[{"type":"colour","width":"full","data":{"name":"Hex colour","hex":"#19C3E6","group":"source","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":0,"y":0,"w":100,"h":100}}}]},"output":{"blocks":[{"type":"colour","width":"full","data":{"name":"RGB channels","hex":"#19C3E6","group":"source","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":true,"layout":{"x":0,"y":0,"w":100,"h":100}}}]},"categories":[{"name":"Colour and Design","slug":"colour-design"}],"topics":[{"name":"Computing","slug":"computing"},{"name":"Physics","slug":"physics"}],"sources":[{"title":"CSS Color Module Level 4: hex notation","url":"https://www.w3.org/TR/css-color-4/#hex-notation","publisher":"W3C","licence":"CC-BY-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":2,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["colour"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 19:20:09"}
{"id":44,"slug":"surrounding-colour-shifts-perception","title":"Surrounding colour changes perceived colour","summary":"Two identical greys look different once their backgrounds change.","library":"learning","relationship_type":"reveals","relationship":"The visual system evaluates local contrast rather than reading each sample in isolation. Change the surrounds or the shared sample with the colour pickers.","input":{"blocks":[{"type":"colour","width":"full","data":{"name":"Light surround","hex":"#E8DFD0","group":"light-bg","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":0,"y":0,"w":50,"h":100}}},{"type":"colour","width":"full","data":{"name":"Dark surround","hex":"#1A1410","group":"dark-bg","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":50,"y":0,"w":50,"h":100}}},{"type":"colour","width":"full","data":{"name":"Sample","hex":"#808080","group":"sample","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":16,"y":34,"w":18,"h":32}}},{"type":"colour","width":"full","data":{"name":"Sample","hex":"#808080","group":"sample","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":66,"y":34,"w":18,"h":32}}}]},"output":{"blocks":[{"type":"colour","width":"full","data":{"name":"Shared surround","hex":"#9A9088","group":"proof-bg","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":0,"y":0,"w":100,"h":100}}},{"type":"colour","width":"full","data":{"name":"Sample","hex":"#808080","group":"sample","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":16,"y":34,"w":18,"h":32}}},{"type":"colour","width":"full","data":{"name":"Sample","hex":"#808080","group":"sample","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":66,"y":34,"w":18,"h":32}}},{"type":"text","width":"full","data":{"text":"Same #808080. The darker surround makes that grey look lighter.","layout":{"x":8,"y":78,"w":84,"h":18}}}]},"categories":[{"name":"Colour and Design","slug":"colour-design"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"Britannica: Color","url":"https://www.britannica.com/science/color","publisher":"Encyclopaedia Britannica","licence":null},{"title":"NASA Science: Visible Light","url":"https://science.nasa.gov/ems/09_visiblelight/","publisher":"NASA Science","licence":"US-PUBLIC-DOMAIN"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":2,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":true,"block_types":["colour","text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 20:43:38"}
{"id":43,"slug":"complementary-colours-increase-contrast","title":"Complementary colours create strong hue contrast","summary":"Opposing hues make a shared edge visually sharp.","library":"learning","relationship_type":"causes","relationship":"The hues stimulate different colour channels and share little hue similarity. Change either side to test other complementary pairs.","input":{"blocks":[{"type":"colour","width":"full","data":{"name":"Blue","hex":"#2563EB","group":"blue","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":0,"y":0,"w":50,"h":100}}},{"type":"colour","width":"full","data":{"name":"Orange","hex":"#F97316","group":"orange","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":50,"y":0,"w":50,"h":100}}}]},"output":{"blocks":[{"type":"colour","width":"full","data":{"name":"Blue","hex":"#2563EB","group":"blue","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":0,"y":0,"w":50,"h":100}}},{"type":"colour","width":"full","data":{"name":"Orange","hex":"#F97316","group":"orange","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":50,"y":0,"w":50,"h":100}}},{"type":"text","width":"full","data":{"text":"The boundary stays high-contrast while the hues stay complementary.","layout":{"x":8,"y":78,"w":84,"h":18}}}]},"categories":[{"name":"Colour and Design","slug":"colour-design"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"Britannica: Color wheel","url":"https://www.britannica.com/science/color-wheel","publisher":"Encyclopaedia Britannica","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":2,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["colour","text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 19:20:09"}
{"id":42,"slug":"white-balance-neutralises-cast","title":"White balance neutralises a colour cast","summary":"Channel gains map a known neutral surface back toward neutral values.","library":"learning","relationship_type":"transforms","relationship":"A warm illuminant pushes greys toward orange. Gains on the blue channel restore a colour that should be neutral. Change the cast and the target grey.","input":{"blocks":[{"type":"colour","width":"full","data":{"name":"Warm scene","hex":"#E8A060","group":"cast","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":0,"y":0,"w":100,"h":100}}},{"type":"colour","width":"full","data":{"name":"Cast grey","hex":"#D4B896","group":"sample","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":28,"y":28,"w":44,"h":44}}}]},"output":{"blocks":[{"type":"colour","width":"full","data":{"name":"Corrected scene","hex":"#F4F1EA","group":"scene","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":0,"y":0,"w":100,"h":100}}},{"type":"colour","width":"full","data":{"name":"Neutral grey","hex":"#C8C4BC","group":"sample","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":28,"y":28,"w":44,"h":44}}}]},"categories":[{"name":"Colour and Design","slug":"colour-design"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"Fujifilm: White balance explained","url":"https://www.fujifilm-x.com/en-gb/learning-centre/white-balance-explained/","publisher":"Fujifilm","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":2,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["colour"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 19:20:09"}
{"id":41,"slug":"cyan-yellow-pigment-make-green","title":"Cyan and yellow pigments combine as green","summary":"Subtractive mixing removes red and blue, leaving green.","library":"learning","relationship_type":"produces","relationship":"Cyan absorbs much red light and yellow absorbs much blue light. The mixture is a channel-by-channel multiply of the two pigment colours.","input":{"blocks":[{"type":"colour","width":"full","data":{"name":"Cyan pigment","hex":"#00FFFF","group":"cyan","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":0,"y":0,"w":50,"h":100}}},{"type":"colour","width":"full","data":{"name":"Yellow pigment","hex":"#FFFF00","group":"yellow","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":50,"y":0,"w":50,"h":100}}}]},"output":{"blocks":[{"type":"colour","width":"full","data":{"name":"Pigment mixture","hex":"#00FF00","group":"mix","role":"fill","mix":"multiply","mixFrom":"cyan,yellow","proportion":100,"channels":false,"layout":{"x":0,"y":0,"w":100,"h":100}}}]},"categories":[{"name":"Colour and Design","slug":"colour-design"}],"topics":[{"name":"Chemistry","slug":"chemistry"},{"name":"Physics","slug":"physics"}],"sources":[{"title":"Britannica: Color","url":"https://www.britannica.com/science/color","publisher":"Encyclopaedia Britannica","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":2,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["colour"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 19:20:09"}
{"id":40,"slug":"rgb-red-green-make-yellow","title":"Red and green light combine as yellow","summary":"Additive mixing of red and green light is perceived as yellow.","library":"learning","relationship_type":"produces","relationship":"The lights add at the surface and reach the eye together. Change either primary; the overlap is the per-channel sum, capped at 255.","input":{"blocks":[{"type":"colour","width":"full","data":{"name":"Red light","hex":"#FF0000","group":"red","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":0,"y":0,"w":50,"h":100}}},{"type":"colour","width":"full","data":{"name":"Green light","hex":"#00FF00","group":"green","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":50,"y":0,"w":50,"h":100}}}]},"output":{"blocks":[{"type":"colour","width":"full","data":{"name":"Added light","hex":"#FFFF00","group":"mix","role":"fill","mix":"add","mixFrom":"red,green","proportion":100,"channels":false,"layout":{"x":0,"y":0,"w":100,"h":100}}}]},"categories":[{"name":"Colour and Design","slug":"colour-design"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"CSS Color Module Level 4","url":"https://www.w3.org/TR/css-color-4/","publisher":"W3C","licence":"CC-BY-4.0"},{"title":"NASA Science: Visible Light","url":"https://science.nasa.gov/ems/09_visiblelight/","publisher":"NASA Science","licence":"US-PUBLIC-DOMAIN"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":2,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["colour"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 19:20:09"}
{"id":39,"slug":"temperature-raises-tire-pressure","title":"Warmer air raises tyre pressure","summary":"Gas particles collide more forcefully as temperature rises.","library":"learning","relationship_type":"causes","relationship":"The average kinetic energy of the enclosed gas increases. More forceful wall collisions raise measured pressure.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A sealed tyre warmed while its volume changes little"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A higher pressure reading in the warm tyre"}}]},"categories":[{"name":"Everyday Science","slug":"everyday-science"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"www.nist.gov: Warmer air raises tyre pressure","url":"https://www.nist.gov/pml/owm/metric-si/unit-conversion/pressure-and-gas-flow-unit-conversions","publisher":"www.nist.gov","licence":"US-PUBLIC-DOMAIN"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":38,"slug":"microwave-heats-food","title":"Microwaves heat water-rich food","summary":"An alternating electromagnetic field drives molecular motion.","library":"learning","relationship_type":"causes","relationship":"The changing field interacts strongly with polar molecules and ions. Their motion and collisions distribute energy as heat.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Water-rich food placed in a microwave oven"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Warmer food, often heating unevenly from its composition and shape"}}]},"categories":[{"name":"Everyday Science","slug":"everyday-science"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"www.fda.gov: Microwaves heat water-rich food","url":"https://www.fda.gov/radiation-emitting-products/resources-you-radiation-emitting-products/microwave-oven-radiation","publisher":"www.fda.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":37,"slug":"sunscreen-reduces-uv","title":"Sunscreen reduces ultraviolet exposure","summary":"Active ingredients absorb, scatter or reflect ultraviolet radiation.","library":"learning","relationship_type":"causes","relationship":"The sunscreen film intercepts part of the incoming UVA and UVB radiation before it reaches living skin cells.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Skin covered evenly with broad-spectrum sunscreen"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A lower ultraviolet dose to covered skin"}}]},"categories":[{"name":"Everyday Science","slug":"everyday-science"}],"topics":[{"name":"Chemistry","slug":"chemistry"}],"sources":[{"title":"www.fda.gov: Sunscreen reduces ultraviolet exposure","url":"https://www.fda.gov/drugs/understanding-over-counter-medicines/sunscreen-how-help-protect-your-skin-sun","publisher":"www.fda.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":36,"slug":"lemon-slows-apple-browning","title":"Lemon juice slows apple browning","summary":"Acidity and antioxidants slow enzymatic oxidation.","library":"learning","relationship_type":"causes","relationship":"Lower pH reduces the activity of browning enzymes, while ascorbic acid reacts with oxygen-derived compounds before pigments form.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Freshly cut apple coated with lemon juice"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Apple flesh that stays pale for longer"}}]},"categories":[{"name":"Everyday Science","slug":"everyday-science"}],"topics":[{"name":"Chemistry","slug":"chemistry"}],"sources":[{"title":"www.fsis.usda.gov: Lemon juice slows apple browning","url":"https://www.fsis.usda.gov/food-safety/safe-food-handling-and-preparation/produce","publisher":"www.fsis.usda.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":35,"slug":"water-oxygen-rust-iron","title":"Water and oxygen rust iron","summary":"Oxidation converts iron into hydrated iron oxides.","library":"learning","relationship_type":"produces","relationship":"Iron loses electrons while oxygen is reduced in the presence of water. Repeated reactions create the reddish corrosion products called rust.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Bare iron exposed to moist air"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A rough layer of iron oxide corrosion"}}]},"categories":[{"name":"Everyday Science","slug":"everyday-science"}],"topics":[{"name":"Chemistry","slug":"chemistry"}],"sources":[{"title":"www.britannica.com: Water and oxygen rust iron","url":"https://www.britannica.com/science/rust","publisher":"www.britannica.com","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":34,"slug":"heat-sets-egg-proteins","title":"Heat turns a liquid egg firm","summary":"Heating unfolds proteins and lets them form a connected network.","library":"learning","relationship_type":"transforms","relationship":"Protein structures unfold as temperature rises. New bonds form between neighbouring proteins and trap water in a solid-like network.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A raw egg heated in a pan"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"An opaque, firm cooked egg"}}]},"categories":[{"name":"Everyday Science","slug":"everyday-science"}],"topics":[{"name":"Cooking","slug":"cooking"}],"sources":[{"title":"www.exploratorium.edu: Heat turns a liquid egg firm","url":"https://www.exploratorium.edu/food/eggs","publisher":"www.exploratorium.edu","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":33,"slug":"warm-air-rises","title":"Warm air rises through cooler air","summary":"Heating lowers density and creates buoyancy.","library":"learning","relationship_type":"causes","relationship":"The warmed air expands and becomes less dense. Denser surrounding air pushes underneath it.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A parcel of air warmed while nearby air stays cooler"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"The warm parcel moves upward and convection begins"}}]},"categories":[{"name":"Everyday Science","slug":"everyday-science"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"www.noaa.gov: Warm air rises through cooler air","url":"https://www.noaa.gov/jetstream/convection","publisher":"www.noaa.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":32,"slug":"oil-floats-on-water","title":"Oil floats on water","summary":"The less dense liquid settles above the denser liquid.","library":"learning","relationship_type":"explains","relationship":"Oil and water do not mix readily. Because the oil has lower density, buoyancy leaves it above the water.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Cooking oil poured into still water"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A separate oil layer on the surface"}}]},"categories":[{"name":"Everyday Science","slug":"everyday-science"}],"topics":[{"name":"Chemistry","slug":"chemistry"}],"sources":[{"title":"www.usgs.gov: Oil floats on water","url":"https://www.usgs.gov/special-topics/water-science-school/science/water-density","publisher":"www.usgs.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":31,"slug":"balloon-static-attracts-hair","title":"A rubbed balloon attracts hair","summary":"Transferred electric charge creates electrostatic force.","library":"learning","relationship_type":"causes","relationship":"Contact and separation transfer electrons between materials. Opposite or induced charges then attract across the small gap.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A rubber balloon rubbed against dry hair"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Hair strands lift toward the balloon"}}]},"categories":[{"name":"Everyday Science","slug":"everyday-science"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"www.weather.gov: A rubbed balloon attracts hair","url":"https://www.weather.gov/safety/lightning-science-electrification","publisher":"www.weather.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":30,"slug":"magnet-attracts-iron","title":"A magnet attracts iron","summary":"A magnetic field aligns domains within a ferromagnetic material.","library":"learning","relationship_type":"causes","relationship":"The external field encourages magnetic domains in the iron to align, producing a net attraction toward the stronger field.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A permanent magnet brought near an iron paper clip"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"The paper clip moves toward the magnet"}}]},"categories":[{"name":"Everyday Science","slug":"everyday-science"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"www.britannica.com: A magnet attracts iron","url":"https://www.britannica.com/science/magnetism","publisher":"www.britannica.com","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":29,"slug":"sun-angle-changes-shadow","title":"Sun angle changes the length of a shadow","summary":"A lower light angle projects an obstruction farther across a surface.","library":"learning","relationship_type":"causes","relationship":"As the apparent position of the Sun changes, the angle of incoming light changes. Low-angle light creates a longer projection.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"The same upright object observed through the day"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A long morning shadow, short midday shadow and long evening shadow"}}]},"categories":[{"name":"Everyday Science","slug":"everyday-science"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"spaceplace.nasa.gov: Sun angle changes the length of a shadow","url":"https://spaceplace.nasa.gov/seasons/en/","publisher":"spaceplace.nasa.gov","licence":"US-PUBLIC-DOMAIN"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":28,"slug":"vibration-produces-sound","title":"A vibrating object produces sound","summary":"Repeated motion creates pressure waves in the surrounding medium.","library":"learning","relationship_type":"produces","relationship":"The moving fork alternately compresses and rarefies nearby air. Those pressure changes travel outward as a sound wave.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A tuning fork struck and allowed to vibrate"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"An audible tone reaching a listener"}}]},"categories":[{"name":"Everyday Science","slug":"everyday-science"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"science.nasa.gov: A vibrating object produces sound","url":"https://science.nasa.gov/ems/03_behaviors/","publisher":"science.nasa.gov","licence":"US-PUBLIC-DOMAIN"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":27,"slug":"heated-metal-expands","title":"Most metal expands when heated","summary":"Greater atomic vibration increases average spacing.","library":"learning","relationship_type":"causes","relationship":"Heating increases vibration within the metal lattice. The average distance between atoms grows slightly.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A metal object warmed above its starting temperature"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A slightly larger metal object"}}]},"categories":[{"name":"Everyday Science","slug":"everyday-science"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"www.nist.gov: Most metal expands when heated","url":"https://www.nist.gov/pml/owm/si-units-temperature","publisher":"www.nist.gov","licence":"US-PUBLIC-DOMAIN"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":26,"slug":"pressure-cooker-speeds-cooking","title":"A pressure cooker cooks food faster","summary":"Higher pressure raises the boiling temperature of water.","library":"learning","relationship_type":"causes","relationship":"Steam cannot escape freely, so pressure rises. Water then boils above its usual boiling point and transfers heat at a higher temperature.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Food and water sealed inside a pressure cooker"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Tender food in less cooking time"}}]},"categories":[{"name":"Everyday Science","slug":"everyday-science"}],"topics":[{"name":"Cooking","slug":"cooking"}],"sources":[{"title":"www.fsis.usda.gov: A pressure cooker cooks food faster","url":"https://www.fsis.usda.gov/food-safety/safe-food-handling-and-preparation/food-safety-basics","publisher":"www.fsis.usda.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":25,"slug":"evaporation-cools-skin","title":"Evaporation cools wet skin","summary":"The fastest water molecules carry energy away as they leave.","library":"learning","relationship_type":"causes","relationship":"Higher-energy water molecules escape into the air first. The remaining water and skin have a lower average molecular energy.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Water on warm skin exposed to moving air"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Drier skin at a lower surface temperature"}}]},"categories":[{"name":"Everyday Science","slug":"everyday-science"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"www.weather.gov: Evaporation cools wet skin","url":"https://www.weather.gov/safety/heat-index","publisher":"www.weather.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":148,"slug":"generated-joke-001","title":"Why did the array bring a map?","summary":"A short technology or logic joke resolved through wordplay.","library":"general","relationship_type":"answers","relationship":"The punchline gives “index” both a location and programming meaning.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Why did the array bring a map?"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"It kept losing its index."}}]},"categories":[{"name":"Jokes and Wordplay","slug":"jokes-wordplay"}],"topics":[{"name":"Humour","slug":"humour"}],"sources":[{"title":"en.wikipedia.org: Why did the array bring a map?","url":"https://en.wikipedia.org/wiki/Pun","publisher":"en.wikipedia.org","licence":"CC-BY-SA-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"generated","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 14:40:45","updated_at":"2026-08-14 15:50:45"}
{"id":2671,"slug":"chemistry-ethanol-combustion","title":"Ethanol burns completely","summary":"C2H5OH + 3 O2 -> 2 CO2 + 3 H2O. A blue flame and substantial heat accompany gaseous products.","library":"learning","relationship_type":"produces","relationship":"Complete combustion transfers electrons to oxygen and forms the fully oxidised products. 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{"id":168,"slug":"generated-joke-003","title":"Why was the stylesheet so calm?","summary":"A short technology or logic joke resolved through wordplay.","library":"general","relationship_type":"answers","relationship":"Layout control is treated as emotional composure.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Why was the stylesheet so calm?"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"It knew how to keep everything in its place."}}]},"categories":[{"name":"Jokes and Wordplay","slug":"jokes-wordplay"}],"topics":[{"name":"Humour","slug":"humour"}],"sources":[{"title":"en.wikipedia.org: Why was the stylesheet so calm?","url":"https://en.wikipedia.org/wiki/Pun","publisher":"en.wikipedia.org","licence":"CC-BY-SA-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"generated","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 11:20:45","updated_at":"2026-08-14 15:50:45"}
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{"id":188,"slug":"generated-joke-005","title":"Why did the function take the lift?","summary":"A short technology or logic joke resolved through wordplay.","library":"general","relationship_type":"answers","relationship":"Higher-order functions become a literal destination.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Why did the function take the lift?"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"It wanted to reach a higher order."}}]},"categories":[{"name":"Jokes and Wordplay","slug":"jokes-wordplay"}],"topics":[{"name":"Humour","slug":"humour"}],"sources":[{"title":"en.wikipedia.org: Why did the function take the lift?","url":"https://en.wikipedia.org/wiki/Pun","publisher":"en.wikipedia.org","licence":"CC-BY-SA-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"generated","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 08:00:46","updated_at":"2026-08-14 15:50:46"}
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{"id":218,"slug":"generated-joke-008","title":"Why did the loop miss the meeting?","summary":"A short technology or logic joke resolved through wordplay.","library":"general","relationship_type":"answers","relationship":"Iteration becomes repetitive conversation.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Why did the loop miss the meeting?"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"It got stuck going over the same point."}}]},"categories":[{"name":"Jokes and Wordplay","slug":"jokes-wordplay"}],"topics":[{"name":"Humour","slug":"humour"}],"sources":[{"title":"en.wikipedia.org: Why did the loop miss the meeting?","url":"https://en.wikipedia.org/wiki/Pun","publisher":"en.wikipedia.org","licence":"CC-BY-SA-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"generated","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-14 03:00:46","updated_at":"2026-08-14 15:50:46"}
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{"id":238,"slug":"generated-joke-010","title":"Why did the server bring an umbrella?","summary":"A short technology or logic joke resolved through wordplay.","library":"general","relationship_type":"answers","relationship":"Cloud computing becomes literal weather.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Why did the server bring an umbrella?"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"It was expecting a cloud request."}}]},"categories":[{"name":"Jokes and Wordplay","slug":"jokes-wordplay"}],"topics":[{"name":"Humour","slug":"humour"}],"sources":[{"title":"en.wikipedia.org: Why did the server bring an umbrella?","url":"https://en.wikipedia.org/wiki/Pun","publisher":"en.wikipedia.org","licence":"CC-BY-SA-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"generated","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-13 23:40:46","updated_at":"2026-08-14 15:50:46"}
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{"id":248,"slug":"generated-joke-011","title":"Why was the password embarrassed?","summary":"A short technology or logic joke resolved through wordplay.","library":"general","relationship_type":"answers","relationship":"Password strength becomes personal confidence.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Why was the password embarrassed?"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Everyone kept saying it was too weak."}}]},"categories":[{"name":"Jokes and Wordplay","slug":"jokes-wordplay"}],"topics":[{"name":"Humour","slug":"humour"}],"sources":[{"title":"en.wikipedia.org: Why was the password embarrassed?","url":"https://en.wikipedia.org/wiki/Pun","publisher":"en.wikipedia.org","licence":"CC-BY-SA-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"generated","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-13 22:00:46","updated_at":"2026-08-14 15:50:46"}
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{"id":268,"slug":"generated-joke-013","title":"Why did the triangle refuse to argue?","summary":"A short technology or logic joke resolved through wordplay.","library":"general","relationship_type":"answers","relationship":"Triangle vertices become viewpoints.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Why did the triangle refuse to argue?"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"It could see all three points."}}]},"categories":[{"name":"Jokes and Wordplay","slug":"jokes-wordplay"}],"topics":[{"name":"Humour","slug":"humour"}],"sources":[{"title":"en.wikipedia.org: Why did the triangle refuse to argue?","url":"https://en.wikipedia.org/wiki/Pun","publisher":"en.wikipedia.org","licence":"CC-BY-SA-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"generated","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-13 18:40:46","updated_at":"2026-08-14 15:50:46"}
{"id":278,"slug":"generated-joke-014","title":"Why did the colour wheel keep spinning?","summary":"A short technology or logic joke resolved through wordplay.","library":"general","relationship_type":"answers","relationship":"Choosing a hue becomes indecision.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Why did the colour wheel keep spinning?"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"It could not pick a hue."}}]},"categories":[{"name":"Jokes and Wordplay","slug":"jokes-wordplay"}],"topics":[{"name":"Humour","slug":"humour"}],"sources":[{"title":"en.wikipedia.org: Why did the colour wheel keep spinning?","url":"https://en.wikipedia.org/wiki/Pun","publisher":"en.wikipedia.org","licence":"CC-BY-SA-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"generated","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-13 17:00:46","updated_at":"2026-08-14 15:50:46"}
{"id":288,"slug":"generated-joke-015","title":"Why did the clock debug at noon?","summary":"A short technology or logic joke resolved through wordplay.","library":"general","relationship_type":"answers","relationship":"Available time becomes clock time.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Why did the clock debug at noon?"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"It finally had the time."}}]},"categories":[{"name":"Jokes and Wordplay","slug":"jokes-wordplay"}],"topics":[{"name":"Humour","slug":"humour"}],"sources":[{"title":"en.wikipedia.org: Why did the clock debug at noon?","url":"https://en.wikipedia.org/wiki/Pun","publisher":"en.wikipedia.org","licence":"CC-BY-SA-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"generated","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-13 15:20:46","updated_at":"2026-08-14 15:50:46"}
{"id":24,"slug":"rainbow-from-prism","title":"A prism separates white light into colours","summary":"Refraction varies with wavelength.","library":"learning","relationship_type":"transforms","relationship":"The light changes speed at each surface. Different wavelengths refract by different amounts, spreading into a visible spectrum.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"White light entering a glass prism"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A band of spectral colours"}}]},"categories":[{"name":"Everyday Science","slug":"everyday-science"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"science.nasa.gov: A prism separates white light into colours","url":"https://science.nasa.gov/ems/09_visiblelight/","publisher":"science.nasa.gov","licence":"US-PUBLIC-DOMAIN"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-13 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":298,"slug":"generated-joke-016","title":"Why did the API answer politely?","summary":"A short technology or logic joke resolved through wordplay.","library":"general","relationship_type":"answers","relationship":"An API response becomes a social response.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Why did the API answer politely?"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"It had excellent response manners."}}]},"categories":[{"name":"Jokes and Wordplay","slug":"jokes-wordplay"}],"topics":[{"name":"Humour","slug":"humour"}],"sources":[{"title":"en.wikipedia.org: Why did the API answer politely?","url":"https://en.wikipedia.org/wiki/Pun","publisher":"en.wikipedia.org","licence":"CC-BY-SA-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"generated","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-13 13:40:46","updated_at":"2026-08-14 15:50:46"}
{"id":23,"slug":"average-of-five-numbers","title":"Find the arithmetic mean of five values","summary":"Summing and dividing distributes the total evenly.","library":"learning","relationship_type":"solves","relationship":"Add the values to get 45, then divide by the count of five.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Values 4, 7, 9, 10 and 15"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"An arithmetic mean of 9"}}]},"categories":[{"name":"Mathematics","slug":"mathematics"}],"topics":[{"name":"Geometry","slug":"geometry"}],"sources":[{"title":"mathworld.wolfram.com: Find the arithmetic mean of five values","url":"https://mathworld.wolfram.com/ArithmeticMean.html","publisher":"mathworld.wolfram.com","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-12 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":22,"slug":"three-switches-one-bulb","title":"Identify one bulb using three switches","summary":"Heat provides a second observable state.","library":"general","relationship_type":"solves","relationship":"Turn on switch one for several minutes, turn it off, turn on switch two, then enter. A lit bulb maps to two, a warm unlit bulb to one, and a cool unlit bulb to three.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Three switches outside a room and one bulb inside"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"The controlling switch identified in one visit"}}]},"categories":[{"name":"Puzzles and Riddles","slug":"puzzles-riddles"}],"topics":[{"name":"Logic","slug":"logic"}],"sources":[{"title":"en.wikipedia.org: Identify one bulb using three switches","url":"https://en.wikipedia.org/wiki/Induction_puzzles","publisher":"en.wikipedia.org","licence":"CC-BY-SA-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-11 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":21,"slug":"river-crossing-fox-goose-grain","title":"Solve the fox, goose and grain crossing","summary":"A safe sequence prevents incompatible pairs being left together.","library":"general","relationship_type":"solves","relationship":"Take the goose across, return alone, take the fox, bring the goose back, take the grain, return alone, then take the goose.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A farmer, fox, goose, grain and a one-passenger boat"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Everyone reaches the opposite bank safely"}}]},"categories":[{"name":"Puzzles and Riddles","slug":"puzzles-riddles"}],"topics":[{"name":"Logic","slug":"logic"}],"sources":[{"title":"en.wikipedia.org: Solve the fox, goose and grain crossing","url":"https://en.wikipedia.org/wiki/Fox,_goose_and_bag_of_beans_puzzle","publisher":"en.wikipedia.org","licence":"CC-BY-SA-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-10 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":20,"slug":"why-metal-feels-colder","title":"Why does metal feel colder than wood?","summary":"Different thermal conductivity changes heat flow from your skin.","library":"general","relationship_type":"answers","relationship":"Metal conducts heat away from skin faster than wood, making skin temperature fall more quickly at the contact point.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Metal and wood at the same room temperature"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Metal feels colder even though both objects began at the same temperature"}}]},"categories":[{"name":"Questions and Answers","slug":"questions-answers"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"www.britannica.com: Why does metal feel colder than wood?","url":"https://www.britannica.com/science/thermal-conductivity","publisher":"www.britannica.com","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-09 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":19,"slug":"why-sky-looks-blue","title":"Why does the daytime sky look blue?","summary":"Shorter visible wavelengths scatter more strongly in the atmosphere.","library":"general","relationship_type":"answers","relationship":"Small molecules scatter shorter visible wavelengths much more than longer ones. Scattered blue light reaches observers from across the sky.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"White sunlight entering Earth’s atmosphere"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A sky that appears predominantly blue"}}]},"categories":[{"name":"Questions and Answers","slug":"questions-answers"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"spaceplace.nasa.gov: Why does the daytime sky look blue?","url":"https://spaceplace.nasa.gov/blue-sky/en/","publisher":"spaceplace.nasa.gov","licence":"US-PUBLIC-DOMAIN"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-08 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":18,"slug":"compost-turns-scraps-into-soil-amendment","title":"Composting turns scraps into soil amendment","summary":"Decomposers break organic material into stable matter.","library":"learning","relationship_type":"transforms","relationship":"Microorganisms consume organic material. Turning supplies oxygen and balanced moisture supports aerobic decomposition.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Balanced food scraps, dry plant matter, air and moisture"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Dark, crumbly compost"}}]},"categories":[{"name":"Practical Skills","slug":"practical-skills"}],"topics":[{"name":"Cooking","slug":"cooking"}],"sources":[{"title":"www.epa.gov: Composting turns scraps into soil amendment","url":"https://www.epa.gov/recycle/composting-home","publisher":"www.epa.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-07 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":17,"slug":"washing-hands-removes-microbes","title":"Washing hands removes many microbes","summary":"Soap, friction and rinsing detach contamination.","library":"learning","relationship_type":"causes","relationship":"Lather reaches skin surfaces, friction loosens material, and running water carries the suspended material away.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Hands, soap and clean running water"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Cleaner hands with reduced microbial load"}}]},"categories":[{"name":"Practical Skills","slug":"practical-skills"}],"topics":[{"name":"Cooking","slug":"cooking"}],"sources":[{"title":"www.cdc.gov: Washing hands removes many microbes","url":"https://www.cdc.gov/clean-hands/about/index.html","publisher":"www.cdc.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-06 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":16,"slug":"supply-drop-and-price","title":"A supply drop can raise market price","summary":"With other conditions held constant, scarcity changes the equilibrium.","library":"learning","relationship_type":"causes","relationship":"The supply curve shifts left. Buyers compete for fewer units until quantity demanded and quantity supplied meet at a higher price.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Stable demand and a sudden reduction in supply"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Lower traded quantity and a higher equilibrium price"}}]},"categories":[{"name":"Society and Systems","slug":"society-systems"}],"topics":[{"name":"Communication","slug":"communication"}],"sources":[{"title":"openstax.org: A supply drop can raise market price","url":"https://openstax.org/books/principles-economics-3e/pages/3-introduction-to-demand-and-supply","publisher":"openstax.org","licence":"CC-BY-4.0"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-05 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":15,"slug":"feedback-improves-a-draft","title":"Specific feedback improves a draft","summary":"Actionable observations guide revision.","library":"learning","relationship_type":"transforms","relationship":"The writer classifies each comment, tests it against the goal, changes the draft and checks whether the change solved the stated issue.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A first draft and focused reviewer comments"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A clearer revised draft with documented decisions"}}]},"categories":[{"name":"Society and Systems","slug":"society-systems"}],"topics":[{"name":"Communication","slug":"communication"}],"sources":[{"title":"owl.purdue.edu: Specific feedback improves a draft","url":"https://owl.purdue.edu/owl/general_writing/the_writing_process/proofreading/index.html","publisher":"owl.purdue.edu","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-04 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":14,"slug":"parallel-batteries-voltage","title":"Parallel batteries keep the same voltage","summary":"Parallel connection changes available capacity, not nominal voltage.","library":"learning","relationship_type":"explains","relationship":"Positive terminals share one node and negative terminals share another, so both cells impose the same potential difference.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Two identical 1.5 V cells connected in parallel"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A 1.5 V supply with greater potential capacity"}}]},"categories":[{"name":"Technology","slug":"technology"}],"topics":[{"name":"Computing","slug":"computing"}],"sources":[{"title":"www.allaboutcircuits.com: Parallel batteries keep the same voltage","url":"https://www.allaboutcircuits.com/textbook/direct-current/chpt-3/battery-ratings/","publisher":"www.allaboutcircuits.com","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-03 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":13,"slug":"knife-angle-and-slicing","title":"A slicing motion cuts bread cleanly","summary":"Forward motion concentrates force along a moving edge.","library":"learning","relationship_type":"demonstrates","relationship":"Use light downward pressure while moving the blade back and forth. The serrations engage the crust progressively instead of crushing the loaf.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A serrated knife and a loaf of bread"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Even slices with less compression"}}]},"categories":[{"name":"Practical Skills","slug":"practical-skills"}],"topics":[{"name":"Cooking","slug":"cooking"}],"sources":[{"title":"www.exploratorium.edu: A slicing motion cuts bread cleanly","url":"https://www.exploratorium.edu/food","publisher":"www.exploratorium.edu","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-02 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":12,"slug":"cold-glass-condensation","title":"Water forms on the outside of a cold glass","summary":"Cooling humid air causes condensation.","library":"learning","relationship_type":"causes","relationship":"Air beside the glass cools below its dew point. Water vapour then changes phase into liquid droplets on the outer surface.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A cold glass in humid air"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Liquid droplets outside the glass"}}]},"categories":[{"name":"Everyday Science","slug":"everyday-science"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"www.weather.gov: Water forms on the outside of a cold glass","url":"https://www.weather.gov/arx/why_dewpoint_vs_humidity","publisher":"www.weather.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-08-01 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":11,"slug":"soap-lifts-grease","title":"Soap helps water lift grease","summary":"Amphiphilic molecules connect oily material to water.","library":"learning","relationship_type":"explains","relationship":"Soap molecules have water-attracting and oil-attracting regions. They surround small grease droplets so those droplets can disperse in rinse water.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Grease, water and soap"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Grease suspended in water and carried away"}}]},"categories":[{"name":"Everyday Science","slug":"everyday-science"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"www.britannica.com: Soap helps water lift grease","url":"https://www.britannica.com/science/soap","publisher":"www.britannica.com","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-07-31 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":10,"slug":"plant-bends-toward-light","title":"A plant shoot bends toward light","summary":"Uneven growth produces phototropism.","library":"learning","relationship_type":"causes","relationship":"Light sensing redistributes growth signals. Cells on the shaded side elongate more, curving the shoot toward the light.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A young shoot lit from one side"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A shoot curved toward the light source"}}]},"categories":[{"name":"Everyday Science","slug":"everyday-science"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"www.britannica.com: A plant shoot bends toward light","url":"https://www.britannica.com/science/phototropism","publisher":"www.britannica.com","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-07-30 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":9,"slug":"acid-and-bicarbonate","title":"Acid and bicarbonate release carbon dioxide","summary":"An acid-base reaction creates visible gas bubbles.","library":"learning","relationship_type":"produces","relationship":"Hydrogen ions react with bicarbonate to form carbonic acid, which breaks down into water and carbon dioxide gas.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Vinegar and sodium bicarbonate"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Sodium acetate solution, water and carbon dioxide"}}]},"categories":[{"name":"Everyday Science","slug":"everyday-science"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"pubchem.ncbi.nlm.nih.gov: Acid and bicarbonate release carbon dioxide","url":"https://pubchem.ncbi.nlm.nih.gov/compound/Sodium-bicarbonate","publisher":"pubchem.ncbi.nlm.nih.gov","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-07-29 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":8,"slug":"camera-aperture-and-light","title":"A wider aperture admits more light","summary":"The opening size changes exposure and depth of field.","library":"learning","relationship_type":"causes","relationship":"A smaller f-number represents a wider opening. Moving two full stops wider admits four times as much light for the same shutter time.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A lens changed from f/8 to f/4"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A brighter exposure with shallower depth of field"}}]},"categories":[{"name":"Technology","slug":"technology"}],"topics":[{"name":"Computing","slug":"computing"}],"sources":[{"title":"www.nikonusa.com: A wider aperture admits more light","url":"https://www.nikonusa.com/learn-and-explore/c/tips-and-techniques/understanding-maximum-aperture","publisher":"www.nikonusa.com","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-07-28 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":7,"slug":"url-to-web-page","title":"A URL becomes a web page","summary":"Several network steps turn an address into rendered content.","library":"learning","relationship_type":"explains","relationship":"DNS resolves the host, the browser establishes a secure connection, requests resources, parses HTML and CSS, then paints the page.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A URL entered in a browser"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"An interactive rendered web page"}}]},"categories":[{"name":"Technology","slug":"technology"}],"topics":[{"name":"Computing","slug":"computing"}],"sources":[{"title":"developer.mozilla.org: A URL becomes a web page","url":"https://developer.mozilla.org/en-US/docs/Web/Performance/How_browsers_work","publisher":"developer.mozilla.org","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-07-27 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":6,"slug":"binary-to-decimal-1011","title":"Convert binary 1011 to decimal","summary":"Place values convert a base-two number into base ten.","library":"learning","relationship_type":"transforms","relationship":"Add the active place values: 8 + 0 + 2 + 1.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Binary number 1011"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Decimal number 11"}}]},"categories":[{"name":"Technology","slug":"technology"}],"topics":[{"name":"Computing","slug":"computing"}],"sources":[{"title":"www.nist.gov: Convert binary 1011 to decimal","url":"https://www.nist.gov/pml/owm/metric-si/si-units","publisher":"www.nist.gov","licence":"US-PUBLIC-DOMAIN"}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-07-26 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":5,"slug":"area-of-a-circle","title":"Find the area of a circle","summary":"Radius is transformed into area using pi times radius squared.","library":"learning","relationship_type":"solves","relationship":"Square the radius and multiply by pi: π × 4².","input":{"blocks":[{"type":"text","width":"full","data":{"text":"A circle with radius 4 units"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"An area of 16π, about 50.27 square units"}}]},"categories":[{"name":"Mathematics","slug":"mathematics"}],"topics":[{"name":"Geometry","slug":"geometry"}],"sources":[{"title":"mathworld.wolfram.com: Find the area of a circle","url":"https://mathworld.wolfram.com/Circle.html","publisher":"mathworld.wolfram.com","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-07-25 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":4,"slug":"triangle-angle-sum","title":"The angles of a triangle sum to 180 degrees","summary":"A parallel-line construction reveals the angle sum.","library":"learning","relationship_type":"demonstrates","relationship":"Draw a line through one vertex parallel to the opposite side. Alternate interior angles place all three triangle angles along one straight line.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Any triangle on a flat plane"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Three adjacent angles forming 180 degrees"}}]},"categories":[{"name":"Mathematics","slug":"mathematics"}],"topics":[{"name":"Geometry","slug":"geometry"}],"sources":[{"title":"mathworld.wolfram.com: The angles of a triangle sum to 180 degrees","url":"https://mathworld.wolfram.com/Triangle.html","publisher":"mathworld.wolfram.com","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":true,"block_types":["text"],"provenance":null,"published_at":"2026-07-24 14:42:38","updated_at":"2026-08-14 20:43:39"}
{"id":3,"slug":"yeast-makes-bread-dough-rise","title":"Yeast makes bread dough rise","summary":"Fermentation creates gas that expands a dough structure.","library":"learning","relationship_type":"causes","relationship":"Yeast metabolizes available sugars and releases carbon dioxide. The dough gluten network traps gas bubbles and expands.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Flour, water, yeast and time"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"Aerated, risen dough"}}]},"categories":[{"name":"Everyday Science","slug":"everyday-science"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"www.britannica.com: Yeast makes bread dough rise","url":"https://www.britannica.com/science/fermentation","publisher":"www.britannica.com","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["text"],"provenance":null,"published_at":"2026-07-23 14:42:38","updated_at":"2026-08-14 14:42:38"}
{"id":2,"slug":"salt-lowers-water-freezing-point","title":"Salt lowers the freezing point of water","summary":"Dissolved salt makes liquid water freeze at a lower temperature.","library":"learning","relationship_type":"causes","relationship":"Dissolved ions interfere with formation of the ordered ice crystal structure, so a lower temperature is needed for freezing.","input":{"blocks":[{"type":"text","width":"full","data":{"text":"Ice, liquid water and salt"}}]},"output":{"blocks":[{"type":"text","width":"full","data":{"text":"A colder saltwater solution and melting surface ice"}}]},"categories":[{"name":"Everyday Science","slug":"everyday-science"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"chem.washington.edu: Salt lowers the freezing point of water","url":"https://chem.washington.edu/lecture-demos/freezing-point-depression","publisher":"chem.washington.edu","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":true,"block_types":["text"],"provenance":null,"published_at":"2026-07-22 14:42:38","updated_at":"2026-08-14 20:43:39"}
{"id":1,"slug":"blue-and-red-pigment-make-violet","title":"Blue and red pigment make violet","summary":"Mixing blue and red pigments produces a violet hue.","library":"learning","relationship_type":"transforms","relationship":"Pigment particles absorb different wavelengths. Combining them broadens absorption and leaves a violet appearance, shown here as a multiply blend.","input":{"blocks":[{"type":"colour","width":"full","data":{"name":"Blue pigment","hex":"#1D4ED8","group":"blue","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":0,"y":0,"w":50,"h":100}}},{"type":"colour","width":"full","data":{"name":"Red pigment","hex":"#B91C1C","group":"red","role":"fill","mix":"","mixFrom":"","proportion":100,"channels":false,"layout":{"x":50,"y":0,"w":50,"h":100}}}]},"output":{"blocks":[{"type":"colour","width":"full","data":{"name":"Violet mixture","hex":"#160C1A","group":"mix","role":"fill","mix":"multiply","mixFrom":"blue,red","proportion":100,"channels":false,"layout":{"x":0,"y":0,"w":100,"h":100}}}]},"categories":[{"name":"Colour and Design","slug":"colour-design"}],"topics":[{"name":"Physics","slug":"physics"}],"sources":[{"title":"Britannica: Color","url":"https://www.britannica.com/science/color","publisher":"Encyclopaedia Britannica","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":2,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"community","is_example":false,"block_types":["colour"],"provenance":null,"published_at":"2026-07-21 14:42:38","updated_at":"2026-08-14 19:20:09"}
{"id":3001,"slug":"encode-decode-base64","title":"Encode and decode Base64 text","summary":"Switch between UTF-8 text and Base64, with examples for JavaScript, Python and PHP.","library":"learning","relationship_type":"transforms","relationship":"Base64 maps each group of three input bytes to four printable characters. It is reversible encoding, not encryption, and provides no secrecy.","input":{"blocks":[{"type":"codec","width":"full","data":{"role":"input","group":"encode-decode-base64","algorithm":"base64","label":"Text or Base64","value":"Hello, world!","secret":""}}]},"output":{"blocks":[{"type":"codec","width":"full","data":{"role":"output","group":"encode-decode-base64","algorithm":"base64","label":"Transformed result","value":"SGVsbG8sIHdvcmxkIQ==","secret":""}}]},"categories":[{"name":"Technology","slug":"technology"}],"topics":[{"name":"Computing","slug":"computing"}],"sources":[{"title":"RFC 4648: Base-N Encodings","url":"https://www.rfc-editor.org/rfc/rfc4648","publisher":"RFC Editor","licence":null},{"title":"MDN: Base64","url":"https://developer.mozilla.org/en-US/docs/Glossary/Base64","publisher":"Mozilla Developer Network","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"generated","is_example":true,"block_types":["codec"],"provenance":null,"published_at":"2026-07-15 17:21:27","updated_at":"2026-08-14 20:43:38"}
{"id":3002,"slug":"encode-decode-url-components","title":"Encode and decode URL components","summary":"Turn unsafe URL characters into percent-encoded bytes and decode them again.","library":"learning","relationship_type":"transforms","relationship":"Percent encoding represents a UTF-8 byte as a percent sign followed by two hexadecimal digits. Reserved URL delimiters are encoded when they belong to a component value.","input":{"blocks":[{"type":"codec","width":"full","data":{"role":"input","group":"encode-decode-url-components","algorithm":"url","label":"Text or encoded component","value":"query=results library&page=1","secret":""}}]},"output":{"blocks":[{"type":"codec","width":"full","data":{"role":"output","group":"encode-decode-url-components","algorithm":"url","label":"Transformed result","value":"query%3Dresults%20library%26page%3D1","secret":""}}]},"categories":[{"name":"Technology","slug":"technology"}],"topics":[{"name":"Computing","slug":"computing"}],"sources":[{"title":"WHATWG URL Standard: Percent-encoded bytes","url":"https://url.spec.whatwg.org/#percent-encoded-bytes","publisher":"WHATWG","licence":null},{"title":"MDN: encodeURIComponent()","url":"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/encodeURIComponent","publisher":"Mozilla Developer Network","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"generated","is_example":false,"block_types":["codec"],"provenance":null,"published_at":"2026-07-15 17:18:27","updated_at":"2026-08-14 17:21:27"}
{"id":3003,"slug":"encode-decode-utf8-hex","title":"Encode and decode UTF-8 hexadecimal bytes","summary":"Inspect text as hexadecimal UTF-8 bytes, then reconstruct the original text.","library":"learning","relationship_type":"transforms","relationship":"UTF-8 first maps each Unicode scalar value to one or more bytes. Hexadecimal then writes every byte as two base-sixteen digits.","input":{"blocks":[{"type":"codec","width":"full","data":{"role":"input","group":"encode-decode-utf8-hex","algorithm":"hex","label":"Text or hexadecimal bytes","value":"Hello","secret":""}}]},"output":{"blocks":[{"type":"codec","width":"full","data":{"role":"output","group":"encode-decode-utf8-hex","algorithm":"hex","label":"Transformed result","value":"48 65 6c 6c 6f","secret":""}}]},"categories":[{"name":"Technology","slug":"technology"}],"topics":[{"name":"Computing","slug":"computing"}],"sources":[{"title":"WHATWG Encoding Standard: UTF-8","url":"https://encoding.spec.whatwg.org/#utf-8","publisher":"WHATWG","licence":null},{"title":"MDN: TextEncoder","url":"https://developer.mozilla.org/en-US/docs/Web/API/TextEncoder","publisher":"Mozilla Developer Network","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"generated","is_example":false,"block_types":["codec"],"provenance":null,"published_at":"2026-07-15 17:15:27","updated_at":"2026-08-14 17:21:27"}
{"id":3004,"slug":"encrypt-decrypt-aes-gcm","title":"Encrypt and decrypt text with AES-GCM","summary":"Encrypt text locally with authenticated encryption, then decrypt the packaged payload with the same passphrase.","library":"learning","relationship_type":"transforms","relationship":"PBKDF2 derives a 256-bit key from the passphrase and a random salt. AES-GCM encrypts the UTF-8 bytes with a fresh 96-bit initialization vector and authenticates the ciphertext. The salt, vector and ciphertext are packaged together for this demonstration.","input":{"blocks":[{"type":"codec","width":"full","data":{"role":"input","group":"encrypt-decrypt-aes-gcm","algorithm":"aes-gcm","label":"Plaintext or encrypted payload","value":"The result is useful.","secret":"correct horse battery staple"}}]},"output":{"blocks":[{"type":"codec","width":"full","data":{"role":"output","group":"encrypt-decrypt-aes-gcm","algorithm":"aes-gcm","label":"Transformed result","value":"Generated locally after the page loads.","secret":""}}]},"categories":[{"name":"Technology","slug":"technology"}],"topics":[{"name":"Computing","slug":"computing"}],"sources":[{"title":"NIST SP 800-38D: GCM and GMAC","url":"https://csrc.nist.gov/pubs/sp/800/38/d/final","publisher":"National Institute of Standards and Technology","licence":"US-PUBLIC-DOMAIN"},{"title":"NIST SP 800-132: Password-Based Key Derivation","url":"https://csrc.nist.gov/pubs/sp/800/132/final","publisher":"National Institute of Standards and Technology","licence":"US-PUBLIC-DOMAIN"},{"title":"MDN: SubtleCrypto encrypt()","url":"https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto/encrypt","publisher":"Mozilla Developer Network","licence":null}],"creator_profile":{"handle":"library","display_name":"The Results Library","verified":true},"revision":1,"licence":"CC0-1.0","rights":{"id":"CC0-1.0","label":"CC0 1.0 Universal","url":"https://creativecommons.org/publicdomain/zero/1.0/","status":"cc0","attribution_required":false,"share_alike":false,"importable":true},"origin_type":"generated","is_example":false,"block_types":["codec"],"provenance":null,"published_at":"2026-07-15 17:12:27","updated_at":"2026-08-14 17:21:27"}