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Math & systems Storybook Should You Switch Doors? probabilitylogic Open the story Math & systems Storybook One line or many lines? queuesaverages Open the story Math & systems Storybook Can you mix two photos so a stranger can't read them, but your friend can? encryptionsecrets Open the story Math & systems Storybook Will anyone get their own back? probabilitycounting Open the story Math & systems Storybook Can friends make a secret on a public line? encryptionsecrets Open the story Math & systems Storybook Are Some Infinities Bigger? infinitycounting Open the story Math & systems Storybook Why can one cable cut disconnect a whole area while another barely matters? networkspaths Open the story Math & systems Storybook In a room of 30 kids, what are the odds two of them share a birthday? probabilitypatterns Open the story Math & systems Storybook How do fireflies sync with no leader? networksfeedback Open the story Life & body Storybook How can respiratory germs find a way in? germscontagion Open the story Life & body Storybook Why can one bump feel like two? neuronssenses Open the story Chemistry & materials Storybook How can one purple juice turn pink and green? acidsbases Open the story Chemistry & materials Storybook Why won't oil and water mix? mixingoil Open the story Physics & forces Storybook Which cart presses the mud harder? pressureforce Open the story Math & systems Storybook How does a computer remember when the power is gone? memorycomputers Open the story Math & systems Storybook Can a tiny fast gear lift a heavy crate? gearsratios Open the story Chemistry & materials Storybook Can water get too full? dissolvingsaturation Open the story Chemistry & materials Storybook Where does dissolved sugar go? dissolvingmass Open the story Physics & forces Storybook Why does a bulb only light up when the wire makes a full loop? electricitycircuits Open the story Physics & forces Storybook Why Do Magnets Pull and Push? magnetsforce Open the story Physics & forces Storybook Why does a balloon get squished when you dive deep in a pool? pressurefloating Open the story Physics & forces Storybook What Makes Things Slippery? frictionmotion Open the story Light & sound Storybook Can adding sound make a plane quieter? soundwaves Open the story Physics & forces Storybook What Happens When a Spinning Skater Pulls Her Arms In? spinmotion Open the story Earth & space Storybook How fast does the Sun's pull fade? gravityspace Open the story Earth & space Storybook Which journey rounds a grain more? rockserosion Open the story Earth & space Storybook Why do waves break at the shore? wavesocean Open the story Earth & space Storybook The Moon keeps one face toward us — so is it spinning, or frozen still? moonorbit Open the story Life & body Storybook How can one eye miss a patch while the world still looks complete? eyesvision Open the story Chemistry & materials Storybook What happens to a birthday candle's smoke right after you blow it out? firecandles Open the story Chemistry & materials Storybook Why can cornstarch goo feel solid and liquid? materialsnon-newtonian Open the story Chemistry & materials Storybook Which way will the pepper raft go? surface tensionwater Open the story Chemistry & materials Storybook Will this energy ledger warm or cool? chemistryreactions Open the story Chemistry & materials Storybook Which fizz lever wins this race? chemistryreactions Open the story Chemistry & materials Storybook Can stacked liquids catch an object that sinks in water? densityliquids Open the story Math & systems Storybook Is going first a guaranteed win? gamesstrategy Open the story Math & systems Storybook Can a message fix itself if it gets scrambled? informationerror correction Open the story Math & systems Storybook Which crease pairs every mark? symmetrypatterns Open the story Chemistry & materials Storybook Why do crystals have flat sides? crystalsshapes Open the story Light & sound Storybook Why does a spoon look bent in water? lightrefraction Open the story Physics & forces Storybook Why does a moving magnet make power? magnetselectricity Open the story Physics & forces Storybook Why does a moving bike stay up? balancemotion Open the story Physics & forces Storybook Why does a ball on a string fly off the second you let go? motionforce Open the story Physics & forces Storybook Why do tightrope walkers carry a long pole? balancemotion Open the story Physics & forces Storybook Is it harder to START a box sliding or to KEEP it sliding? frictionforce Open the story Light & sound Storybook What does a microwave actually heat? waveswater Open the story Math & systems Storybook Why does WiFi slow down when busy? networksinternet Open the story Physics & forces Storybook Why are heavy things hard to push? motionforce Open the story Math & systems Storybook How long is a coastline? fractalsmeasurement Open the story Math & systems Storybook How does a phone shrink a huge photo? compressionfiles Open the story Math & systems Storybook Is the Coin Due for Tails? probabilityrandomness Open the story Earth & space Storybook How does your phone know exactly where you are? spacesatellites Open the story Physics & forces Storybook How does the AC make cold air? heathome Open the story Math & systems Storybook What's the fastest way to search? searchingalgorithms Open the story Chemistry & materials Storybook How does soap grab grease? soapwater Open the story Physics & forces Storybook Why does rubbing a balloon on your hair make it stick to the wall? electricityforce Open the story Chemistry & materials Storybook Why Does Ice Float? waterdensity Open the story Physics & forces Storybook How does a thermometer know how hot it is? heatparticles Open the story Physics & forces Storybook Where does a helium balloon go? airpressure Open the story Light & sound Storybook WiFi, Bluetooth, infrared — why does a TV remote need to point, but your phone doesn't? wavessignals Open the story Earth & space Storybook Why do we have seasons? spaceearth Open the story Math & systems Storybook Why Do Tiny Things Grow Huge? growthmoney Open the story Light & sound Storybook Why does a police siren change its note as it races past you? soundwaves Open the story Physics & forces Storybook Does the shape of a piece of steel decide if it floats? floatingdensity Open the story Physics & forces Storybook Why can a tiny kid lift a giant grown-up on a seesaw? leversbalance Open the story Chemistry & materials Storybook What does fire need to live? fireoxygen Open the story Physics & forces Storybook How does a glass screen know exactly where your finger is? electricitysenses Open the story Physics & forces Storybook Do heavy things fall faster? gravitymotion Open the story Life & body Storybook Why doesn't a whole town get sick at once? germsspread Open the story Light & sound Storybook Why is the sky blue? lightcolor Open the story Light & sound Storybook How does a song fly through the air into your radio? wavessound Open the story Light & sound Experiment Why are clouds white? lightcolor Try it out Life & body Experiment Stare hard at a colored shape, then look away — what shows up? eyescolor Try it out Math & systems Experiment What is a screen picture made of? screenscolor Try it out Math & systems Experiment How do you split a cake so nobody feels cheated? fairnessstrategy Try it out Math & systems Experiment Why does adding a brand-new road sometimes make EVERYONE'S drive slower? networkssystems Try it out Math & systems Experiment Can a streak spot fake randomness? randomnesspatterns Try it out Math & systems Experiment Tipping points — empty or packed? systemsfeedback Try it out Math & systems Experiment Why do gossip, viral videos, and rumors blow up fast at first, then suddenly stall? networksfeedback Try it out Math & systems Experiment Why does a sandpile, dropped one grain at a time, suddenly avalanche — and you can't say which grain did it? systemsfeedback Try it out Math & systems Experiment Why does a tiny rule, repeated over and over, make a giant detailed pattern? patternsfractals Try it out Math & systems Experiment Why can a thermostat (or a body) hold steady, but a microphone near its speaker screams? feedbacksystems Try it out Math & systems Experiment What makes a swing go higher? rhythmpatterns Try it out Life & body Experiment Why can fast breathing hide the warning to breathe? breathingbody Try it out Physics & forces Experiment Why does cold water feel colder than cold air at the same temperature? skinsenses Try it out Life & body Experiment Does a germ’s severity tell us how far it spreads? germscontagion Try it out Life & body Experiment Why did dark moths become more common near smoky cities? evolutionanimals Try it out Life & body Experiment Where does a giant tree's wood actually come from? plantsphotosynthesis Try it out Life & body Experiment Is sunlight or water keeping this plant alive? plantsphotosynthesis Try it out Life & body Experiment Why does a wound get red and puffy when it's healing? immune systemhealing Try it out Life & body Experiment Why does your body remember a germ it already beat? immune systemgerms Try it out Life & body Experiment How does oxygen change the ATP a cell can make from glucose? foodenergy Try it out Life & body Experiment What changes inside your eyes when the lights go off? eyessenses Try it out Life & body Experiment How can pulling muscles make your arm push? musclesbody Try it out Life & body Experiment Why don't your bones snap when you jump? bonesbody Try it out Life & body Experiment What decides whether a cut heals clean or leaves a scar? skinhealing Try it out Life & body Experiment How does your ear tell a high note from a low note? earssound Try it out Earth & space Experiment Why does dropping air pressure tell you a storm is coming? weatherpressure Try it out Earth & space Experiment Why does the wind make giant waves out at sea but not in a pond? oceanswaves Try it out Earth & space Experiment Why is it pitch dark at night when space is full of stars? spacestars Try it out Earth & space Experiment Why do hailstones grow big in summer, the hottest time of year? weatherhail Try it out Earth & space Experiment Why does the wind near the coast switch direction between day and night? weatherwind Try it out Physics & forces Experiment Why do astronauts float if there's still gravity up there? spacegravity Try it out Earth & space Experiment Why does fog appear in the morning and then vanish? weatherfog Try it out Earth & space Experiment Why does a planet's year get longer the farther out it is? spaceorbits Try it out Earth & space Experiment Why does the ocean stay salty but rain is fresh? oceanswater Try it out Earth & space Experiment Why does a hurricane spin in a circle? weatherhurricanes Try it out Earth & space Experiment Why does it get colder the higher up a mountain you go? weathertemperature Try it out Physics & forces Experiment Why doesn't the Moon just fall down onto us? spaceorbits Try it out Earth & space Experiment Why does the day stay light longer in summer? earthseasons Try it out Earth & space Experiment Why does a volcano explode instead of just oozing? earthvolcanoes Try it out Earth & space Experiment Why isn't there an eclipse every single month? spaceeclipses Try it out Earth & space Experiment Why does the Moon change shape every night? spacemoon Try it out Physics & forces Experiment Why does wet sand stick? materialswater Try it out Chemistry & materials Experiment Why does alcohol feel cold? evaporationheat Try it out Physics & forces Experiment What will shaking do to two grain mixtures? mixingmaterials Try it out Chemistry & materials Experiment Why does salt melt ice? dissolvingfreezing Try it out Physics & forces Experiment Why do some things stretch back? materialselasticity Try it out Chemistry & materials Experiment Why is some ice cloudy? freezingcrystals Try it out Chemistry & materials Experiment Why does a cut apple turn brown — and can you stop it? oxygenreactions Try it out Physics & forces Experiment Where does boiling water go? states of matterevaporation Try it out Physics & forces Experiment Why do heavy ships float? densityfloating Try it out Chemistry & materials Experiment Why does glue dry hard? gluedrying Try it out Chemistry & materials Experiment Why do acids fizz on baking soda? acidsbases Try it out Chemistry & materials Experiment Why Does Iron Rust? rustmetals Try it out Chemistry & materials Experiment Why does sugar disappear but sand doesn't? dissolvingwater Try it out Light & sound Experiment Why does shaking a rope fast make tiny ripples but shaking it slow makes big rolls? wavesphysics Try it out Light & sound Experiment Why does the moon look huge near the horizon but tiny up high? lightperception Try it out Light & sound Experiment Why does a sound die out fast in a small room but echo forever in a cave? soundechoes Try it out Light & sound Experiment Why does a red apple turn black under a green light? colorlight Try it out Light & sound Experiment Why does plucking a tighter guitar string make a higher note? soundmusic Try it out Light & sound Experiment Why does a thin soap bubble swirl with rainbow colors when soapy water is clear? lightcolor Try it out Light & sound Experiment What happens when two sound waves overlap? soundwaves Try it out Light & sound Experiment Why does a magnifying glass flip the world upside down when you back it away? lightlenses Try it out Light & sound Experiment Why is a laser pointer a tiny dot far away but a flashlight is just a blob? lightlasers Try it out Light & sound Experiment Why do bendy glass threads carry far more of your video call across the world without it fading? lightfiber Try it out Light & sound Experiment Why does a pencil's shadow have a fuzzy edge sometimes and a sharp edge other times? lightshadows Try it out Light & sound Experiment Why does a rainbow always curve, and could you ever reach its end? lightcolor Try it out Physics & forces Experiment Why does a roller coaster need a big first hill to make it all the way around? motiongravity Try it out Physics & forces Experiment Two sheets of the same paper, same weight — do they fall at the same speed? airgravity Try it out Physics & forces Experiment Why is it easier to lift a heavy bucket from a well with a wheel on top? machinesforce Try it out Physics & forces Experiment Why does a parachute let you fall slowly when a rock just drops? airgravity Try it out Life & body Experiment Why are two eyes better than one? eyessenses Try it out Light & sound Experiment Why does some thunder crack but other thunder rumbles? soundwaves Try it out Physics & forces Experiment Why doesn't the water spill when you swing a bucket over your head? motionforce Try it out Physics & forces Experiment What does spinning do to a top that's about to fall over? balancemotion Try it out Math & systems Experiment If most buses run half-empty, what kind of bus does a random rider land on? averagesprobability Try it out Math & systems Experiment If everyone is driving fine and nobody crashes, how does a traffic jam appear out of nowhere? trafficfeedback Try it out Life & body Experiment Why do you get dizzy after spinning? earsbalance Try it out Life & body Experiment Does your own hand tickle you as much as a friend's? brainsenses Try it out Life & body Experiment Why does your heart beat in two thumps? heartblood Try it out Life & body Experiment Why do you breathe faster when you run? breathingbody Try it out Earth & space Experiment Why do we have tides? oceanstides Try it out Earth & space Experiment Why do you see lightning way before you hear the thunder? weatherthunder Try it out Earth & space Experiment Why does wind blow? weatherwind Try it out Earth & space Experiment Why Does It Rain? weatherrain Try it out Earth & space Experiment Why do clouds float? weatherclouds Try it out Chemistry & materials Experiment Why does metal feel cold? heatmaterials Try it out Chemistry & materials Experiment Why does sugar dissolve faster in warm water? dissolvingheat Try it out Light & sound Experiment Why can a singer shatter a glass with just the right note? soundresonance Try it out Light & sound Experiment Why do colored paints and colored lights mix differently? colorlight Try it out Light & sound Experiment Why can't you see around a corner, but you can hear around one? soundwaves Try it out Physics & forces Experiment Why do holiday lights all go dark when one bulb dies, but house lights don't? electricitycircuits Try it out Physics & forces Experiment Why does hot air rise? floatingpressure Try it out Physics & forces Experiment Which way will these hanging cans move? pressureair Try it out