Every device gets its go from one of four energy forms — heat, light, electricity, or movement — and energy can be stored, waiting to work.


One form of energy turns into another in your own hands: movement becomes heat you can feel — rubbed palms to a cheek, a rubbed coin to the lip.
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No energy in, no going. Light is the car's ONLY fuel — so dimming the light must change the going. A real fair test: change one thing, keep everything else the same.
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Heat travels three ways, and each gets its name said out loud: radiation (felt from the side), convection (warm air rising above), conduction (heat walking up the spoon).
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Aerogel is 99.8% air held in a glass skeleton — the best solid insulator there is. It teaches conduction by flatly refusing to do it: ice sits unmelted above steaming water.
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Wax is stored energy. Burning lets it out — as heat AND light at once — and the wax's tiny particles are not destroyed: like a falling block tower, only the arrangement changes.
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Energy can be handed from one thing to another. Here's one to hold back for the review: a rolling ball knocks the next ball into motion — the push travels.