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Records by The Results Library
LearningBlend two coloursLearningHydrogen and oxygen form waterLearningConvert Celsius to FahrenheitGeneralExplore an arithmetic sequenceLearningMethane undergoes complete combustionLearningHow many sides does the highlighted polygon have?LearningConvert kilometres to milesGeneralFour lines solve the nine-dot puzzle by extending beyond the gridGeneralThe hundred doors puzzle leaves perfect squares openGeneralOne question defeats a liar and a truth-tellerGeneralThree Tower of Hanoi disks require seven movesGeneralSwitching doors wins two thirds of Monty Hall gamesGeneralWhy does sound travel faster in water than in air?GeneralWhy can rain produce an earthy smell?GeneralWhy are free soap bubbles round?GeneralWhy does warmer air tend to rise?GeneralWhy do cut onions make eyes water?LearningStandardised units make measurements comparableLearningDouble-entry bookkeeping records both sides of a transactionLearningA secret ballot reduces direct pressure on individual votersLearningRandom sampling reduces systematic selection biasLearningA clear agenda focuses a meetingLearningA longer hinge screw can correct a mildly sagging doorLearningMulch reduces evaporation from garden soilLearningSharpening restores a knife’s narrow cutting edgeLearningA torque wrench controls fastener tighteningLearningBlanching slows quality loss in frozen vegetablesLearningA digital signature verifies a message against a public keyLearningBinary search halves a sorted search spaceLearningError-correcting codes can recover damaged dataLearningGPS turns timed satellite signals into a position estimateLearningA cryptographic hash reveals whether file bytes changedLearningPercentage change compares a difference with its starting valueLearningSlope converts two points into a rate of changeLearningTwo fair coin tosses produce four equally likely ordered outcomesLearningCompound interest applies growth to previous growthLearningA polarising filter can reduce reflected glareLearningThe Pythagorean theorem finds a right triangle’s hypotenuseLearningLower opacity blends a foreground with its backgroundLearningComplementary colours create strong visual separationLearningCyan, magenta and yellow inks combine toward a dark neutralLearningRed, green and blue light can combine into whiteLearningIce floats because its solid structure is less denseLearningA static charge attracts small paper piecesLearningA pressure cooker raises water’s boiling temperatureLearningIron rusts when water and oxygen are presentLearningEvaporation cools a wet surfaceLearningPeer review challenges a research manuscriptLearningVaccination can reduce transmission opportunitiesLearningA FIFO queue preserves arrival orderLearningA specific email subject improves triageLearningSpaced practice improves later recallLearningDirect pressure helps control external bleedingLearningA pilot hole helps prevent wood splittingLearningBoiling makes microbiologically unsafe water saferLearningRefrigeration slows food spoilageLearningA bowline forms a fixed loopLearningA second measurement reduces cutting errorsLearningInflation reduces the purchasing power of unchanged moneyLearningProgressive tax rates change after-tax income distributionLearningA public good creates a free-rider incentiveGeneralMeasure exactly four litres with two jugsGeneralFind one heavier ball in two weighingsGeneralCross the bridge in 17 minutesGeneralCorrect three mislabeled fruit boxes with one sampleGeneralMeasure 45 minutes with two uneven-burning ropesGeneralWhy do stars twinkle?GeneralWhy does an echo return?GeneralWhy does Earth have seasons?GeneralWhy do oceans have tides?GeneralWhy does the Moon have phases?GeneralWhy do many leaves look green?LearningOpenings on opposite sides create cross-ventilationLearningMise en place reduces cooking mistakesLearningA 3-4-5 triangle has a right angleLearningMicrowaves heat water-rich foodLearningWarmer air raises tyre pressureLearningRed and green light combine as yellowLearningCyan and yellow pigments combine as greenLearningWhite balance neutralises a colour castLearningComplementary colours create strong hue contrastLearningSurrounding colour changes perceived colourLearningConvert #19C3E6 into RGB valuesLearningOpacity blends a foreground with its backgroundLearningContrast ratio helps predict text readabilityLearningSunscreen reduces ultraviolet exposureLearningLemon juice slows apple browningLearningEvaporation cools wet skinLearningA pressure cooker cooks food fasterLearningMost metal expands when heatedLearningA vibrating object produces soundLearningSun angle changes the length of a shadowLearningA magnet attracts ironLearningA rubbed balloon attracts hairLearningOil floats on waterLearningWarm air rises through cooler airLearningHeat turns a liquid egg firmLearningFind the percentage increase from 80 to 100LearningWater and oxygen rust ironLearningCalculate one year of simple interestLearningHTTP caching makes repeat visits fasterLearningA QR code carries a URL into a phoneLearningAn analogue sensor becomes a digital readingLearningA Git commit records a project snapshotLearningDNS turns a domain name into an addressLearningResponsive images select an efficient sourceLearningA service worker can serve a page offlineLearningAn API serialises an object as JSONLearningPreheating makes baking conditions predictableLearningResting dough makes it easier to shapeLearningA database index speeds selective lookupsLearningTLS turns readable web traffic into protected recordsLearningFind the probability of two headsLearningAdd one third and one sixthLearningFind the median of seven valuesLearningSolve 3x + 5 = 20LearningConvert 2.4 kilometres to metresLearningFind the perimeter of a rectangleLearningFind the volume of a cubeLearningCompound 10 percent growth for two yearsLearningFind the slope between two pointsLearningA hash function turns input into a fixed-length digestLearningLossless compression reduces data without losing contentGeneralWhy did the array bring a map?LearningEthanol burns completelyLearningConvert kilograms to poundsLearningMagnesium reacts with oxygenLearningWhat path surrounds the central point?LearningConvert minutes to hoursLearningIron oxidises in moist airGeneralWhy did the database book a therapy session?LearningCopper develops copper oxideLearningConvert litres to US gallonsLearningWhich labelled bar is tallest?LearningZinc displaces hydrogen from acidGeneralWhy was the stylesheet so calm?LearningIron displaces copper from solutionLearningWhere is wave amplitude measured?LearningCopper displaces silver ionsGeneralWhy did the gardener inspect the code?LearningHydrochloric acid neutralises sodium hydroxideLearningWhat does the overlap represent?LearningAcetic acid reacts with bicarbonateGeneralWhy did the function take the lift?LearningCalcium carbonate reacts with hydrochloric acidLearningHydrogen peroxide decomposesLearningHow many unit moves reach the marked point?LearningCalcium carbonate thermally decomposesGeneralWhy did the variable carry a name tag?LearningSodium bicarbonate decomposes on heatingLearningIn which direction does the process move?LearningElectric current splits waterGeneralWhy did the browser visit the bakery?LearningNitrogen and hydrogen form ammoniaLearningWhat does the prism separate?LearningAmmonia and hydrogen chloride form ammonium chlorideGeneralWhy did the loop miss the meeting?LearningSilver chloride precipitatesLearningCopper hydroxide precipitatesGeneralWhy did the pixel apply for a bigger role?LearningCarbon dioxide turns limewater cloudyLearningEthanoic acid and ethanol form an esterGeneralWhy did the server bring an umbrella?LearningPhotosynthesis stores light energyLearningCellular respiration oxidises glucoseGeneralWhy was the password embarrassed?GeneralWhy did the cache leave early?GeneralWhy did the triangle refuse to argue?GeneralWhy did the colour wheel keep spinning?GeneralWhy did the clock debug at noon?LearningA prism separates white light into coloursGeneralWhy did the API answer politely?LearningFind the arithmetic mean of five valuesGeneralIdentify one bulb using three switchesGeneralSolve the fox, goose and grain crossingGeneralWhy does metal feel colder than wood?GeneralWhy does the daytime sky look blue?LearningComposting turns scraps into soil amendmentLearningWashing hands removes many microbesLearningA supply drop can raise market priceLearningSpecific feedback improves a draftLearningParallel batteries keep the same voltageLearningA slicing motion cuts bread cleanlyLearningWater forms on the outside of a cold glassLearningSoap helps water lift greaseLearningA plant shoot bends toward lightLearningAcid and bicarbonate release carbon dioxideLearningA wider aperture admits more lightLearningA URL becomes a web pageLearningConvert binary 1011 to decimalLearningFind the area of a circleLearningThe angles of a triangle sum to 180 degreesLearningYeast makes bread dough riseLearningSalt lowers the freezing point of waterLearningBlue and red pigment make violetLearningEncode and decode Base64 textLearningEncode and decode URL componentsLearningEncode and decode UTF-8 hexadecimal bytesLearningEncrypt and decrypt text with AES-GCM