Series
How It Works Inside
How does a vending machine spot a fake coin? Where do escalator steps disappear to? We open up the things you touch every day with cutaways and 3D diagrams.
6 episodes YouTube playlist
Episodes
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How Do Vending Machines Catch Fake Coins?
Inside the machine, three checkpoints — shape, material, and a final match against real coins and notes — send fakes straight back.
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Where Do Escalator Steps Go?
The step that vanishes at the top flips upside down, travels back beneath the floor, and comes out again at the bottom.
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How Does a Refrigerator Make Things Cold?
The refrigerant carries heat out of the fridge interior and releases it into the room — that is why the back feels warm.
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How Does a Contactless Card Work Without a Battery?
Our secure-card model follows 3 jobs: receiving power, mutual authentication and permitted record updates.
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How Does GPS Know Where You Are?
GPS turns signal travel time into distance and solves place plus clock error with four satellites.
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How Does a Firework Make Its Colors and Shapes?
Stars expand their arrangement into a bloom about 1,000 times wider; metals and layers control color.
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