| Week 1 | โ๏ธ A pencil sharpenerA spinning blade shaves wood into a perfect cone. Shapes and angles in action. |
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| Week 2 | ๐ A car's odometerNumber wheels roll from 9 to 0 and push the next wheel on: place value with real gears. |
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| Week 3 | ๐ A combination lockThree wheels, each with ten digits: 1,000 possible numbers, and only one opens it. |
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| Week 4 | ๐ A staplerA lever pushes a staple through paper, and the anvil bends its legs flat. |
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| Week 5 | ๐ง A refrigeratorA liquid turns to gas inside and carries heat away: solids, liquids and gases at work. |
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| Week 6 | ๐บ A shadufAncient Egyptians lifted Nile water with a pole, a bucket and a heavy counterweight. |
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| Week 7 | ๐ A toasterElectricity heats thin wires until they glow, and a spring pops the toast up. |
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| Week 8 | ๐ฒ A bicyclePedals, a chain and gears: a small wheel turns a big wheel fast. |
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| Week 9 | โ๏ธ An airplane wing Interactive figure in preparationAir flows over a curved wing and lifts it, the same way a bird's wing does. |
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| Week 10 | ๐ A hot-air balloon Interactive figure in preparationHot air is lighter than cool air, so the balloon floats up. |
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| Week 11 | ๐ถ A music box Interactive figure in preparationPins on a turning drum pluck steel teeth: short teeth sing high, long teeth sing low. |
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| Week 12 | ๐ญ A kaleidoscope Interactive figure in preparationThree mirrors reflect beads again and again into a symmetric pattern. |
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| Week 13 | ๐ A loudspeaker Interactive figure in preparationA magnet and a coil push a paper cone back and forth to make sound waves. |
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| Week 14 | ๐๏ธ A crane Interactive figure in preparationPulleys and a counterweight let a crane lift far more than its own arm could. |
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| Week 15 | ๐ท A pinhole camera Interactive figure in preparationLight travels in straight lines, so a tiny hole makes an upside-down picture. |
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| Week 16 | ๐ฐ๏ธ A clock's gears Interactive figure in preparationOne gear turns 12 times faster than another: how a clock shows hours and minutes. |
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| Week 17 | โต A sailboat Interactive figure in preparationWind pushes the sail and the keel stops the boat sliding sideways. |
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| Week 18 | โ๏ธ A balance scale Interactive figure in preparationA beam on a pivot shows which side is heavier, like an equation. |
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| Week 19 | ๐ข A submarine Interactive figure in preparationTanks fill with water to sink and with air to rise: density in action. |
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| Week 20 | ๐น A piano Interactive figure in preparationA key lifts a felt hammer that strikes a string and then falls away. |
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| Week 21 | ๐งญ A compass Interactive figure in preparationA magnetized needle turns to line up with the Earth's magnetic field. |
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| Week 22 | ๐ An Archimedes screw Interactive figure in preparationTurning a spiral inside a tube carries water uphill. |
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| Week 23 | ๐๏ธ A lock and key Interactive figure in preparationPins of different heights line up only for the right key. |
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| Week 24 | ๐ฌ๏ธ A windmill Interactive figure in preparationWind turns the sails, and gears turn a millstone or a generator. |
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| Week 25 | ๐ช A kite Interactive figure in preparationWind pushes up on the tilted kite while the string holds it. |
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| Week 26 | ๐ A tape measure Interactive figure in preparationA curved steel tape stays stiff, and a spring rolls it back in. |
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| Week 27 | โ๏ธ A gear train Interactive figure in preparationBig gear, small gear: trading speed for strength. |
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| Week 28 | ๐ช A coin sorter Interactive figure in preparationCoins of different sizes fall through different slots. |
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| Week 29 | ๐ฆ A flashlight Interactive figure in preparationA battery, a switch and a bulb make a complete loop: a circuit. |
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| Week 30 | ๐ง A water clock Interactive figure in preparationWater drips at a steady rate, and a float rises to show the time. |
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| Week 31 | โ๏ธ A sundial Interactive figure in preparationThe Sun's shadow moves around the dial as the Earth turns. |
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| Week 32 | ๐ณ๏ธ A ship that floats Interactive figure in preparationA steel ship floats because its shape pushes away lots of water: Archimedes' idea. |
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| Week 33 | ๐ญ A telescope Interactive figure in preparationLenses bend light to make faraway things look near. |
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| Week 34 | ๐ A rocketHot gas rushes out the back and pushes the rocket forward. |
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| Week 35 | ๐ฐ๏ธ A satellite Interactive figure in preparationIt falls around the Earth forever: fast enough sideways to keep missing it. |
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| Week 36 | ๐ผ A lighthouse Interactive figure in preparationA lamp and a big lens send a turning beam far over the sea. |
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| Week 37 | ๐ A helicopter Interactive figure in preparationSpinning blades are wings that go round and round. |
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| Week 38 | ๐ฆ A garden sprinkler Interactive figure in preparationWater pushing out of the nozzles spins the sprinkler round. |
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| Week 39 | ๐ A bicycle brake Interactive figure in preparationSqueezing the lever presses pads on the wheel: friction stops you. |
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| Week 40 | ๐ข A roller coaster Interactive figure in preparationClimbing high stores energy; rolling down turns it into speed. |
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| Week 41 | ๐ช A parachute Interactive figure in preparationA big canopy catches air and slows the fall. |
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| Week 42 | ๐ An elevator Interactive figure in preparationA cable, a pulley and a counterweight lift the car gently. |
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| Week 43 | ๐จ๏ธ A printing press Interactive figure in preparationInked letters pressed onto paper: copies for everyone. |
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| Week 44 | ๐ก A light bulb Interactive figure in preparationA thin filament glows when electricity flows through it. |
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| Week 45 | ๐งฎ An adding machine Interactive figure in preparationWheels and carries: the odometer idea turned into a calculator. |
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| Week 46 | ๐ป How computers count Interactive figure in preparationSwitches that are on or off count in 1s and 0s. |
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| Week 47 | ๐ A car engine Interactive figure in preparationLittle explosions push pistons that turn the wheels. |
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| Week 48 | ๐ A water dam Interactive figure in preparationFalling water spins a turbine to make electricity. |
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| Week 49 | ๐ A solar panel Interactive figure in preparationSunlight knocks electrons loose to make electricity. |
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| Week 50 | ๐ฆพ A robot arm Interactive figure in preparationJoints and motors move one step at a time, like code. |
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| Week 51 | ๐งฑ A 3D printer Interactive figure in preparationLayer after layer of melted plastic builds a real object. |
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| Week 52 | ๐ A string telephone Interactive figure in preparationSound travels along a tight string from cup to cup. |
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