Interactive explorationMachines & MotionFour-stroke engines
How does a piston turn fuel into motion?
Open a detailed engine, turn its crank, and take the assembly apart. Follow four different jobs hidden inside two very similar-looking turns.
Eleven new ways to wonder
Turn an engine. Load a boat. Build a bit. Follow a meal. Eleven distinct experiments, each with its own questions, sources and home activity.
Start with the first experiment Search & filter this collection 11 available explorations · choose any starting point
Interactive exploration
Interactive explorationMachines & MotionLevers, pulleys and lifting
How can a small pull lift a heavy load?
Rerig a dock crane. Pull the same length of rope, watch the crate rise, and see what you trade for an easier lift.
A small distance.
A big internal pull.Explore the elbow’s leverage
Interactive explorationA big internal pull.Explore the elbow’s leverage
Body & HealthMuscles, joints and movement
Why can holding a small weight need a big muscle force?
Move a load closer to an elbow on a transparent teaching arm. See the force change, then explore how muscles can work without visible movement.
Interactive explorationComputers, Networks & AIBinary numbers and logic gates
How do zeros and ones become a calculation?
Flip real input bits on a little calculator. Build a result from simple rules, and follow a carry as it crosses four columns.
Interactive explorationPhysics, Light & SoundFloating, sinking and buoyancy
How can a heavy ship float?
Load a tiny barge and watch its waterline rise along the hull. Then lower a block through a tank to connect water pressure with buoyancy.
Interactive explorationCells, Life & EvolutionPhotosynthesis and plant growth
Where does a plant get the material to grow?
Open a leaf, explore a chloroplast, and supply a tiny carbon-building recipe. Discover what comes from air, what comes from water, and what light contributes.
Interactive explorationBody & HealthDigestion and food
What happens to food after you swallow it?
Follow a meal through the gut, then zoom into its lining. Choose starch, protein or long-chain fat and discover why their next routes differ.
Interactive explorationSpace & AstronomyMoon phases and eclipses
Why does the Moon seem to change shape?
Move the Moon around Earth and compare two viewpoints at once. Make a crescent, then tilt the orbit to discover why an eclipse is a special alignment.
Interactive explorationEveryday TechnologyRefrigerators and heat pumps
How does a fridge move heat out of a cold space?
Look through a cold room and follow its refrigerant loop. Count the heat removed and the work added, then try putting both sides in the same room.
Interactive explorationEarth, Weather & ClimatePlate tectonics and moving continents
How can moving rock leave a clock on the ocean floor?
Pull a ridge apart over millions of years. Read the age and magnetic pattern left behind, then compare spreading, sliding and subduction.
Interactive explorationEveryday TechnologyInsulation and heat transfer
How can insulation keep warmth in—and heat out?
Open a house wall. Swap its added layer, make it thicker, and reverse the temperatures to see why insulation helps in winter and summer.
Take these steps at your own pace. Your place is not saved as account progress or scored.