Could you bake a potato in an oven that doesn't get hot? Yes, you could, if it's a microwave oven. In minutes, the potato gets steaming hot, but the oven stays cool! And the glass or china dishes you...
An up-down machine
> An elevator car hangs on steel cables inside a shaft. A pulley turns > the cables to make the car slide up or down. Climbing the stairs in a house is easy. But in a tall building with many...
Frozen food
Fresh foods keep their color and flavor for only a short time. You have to eat them soon after they are bought. Is your piece of apple pie homemade, or did it come frozen? Sometimes it's hard to...
Finding moving things
Air traffic controllers use radar to direct planes near busy airports. The moving spots of light on the radar screen show where each plane is. Airplanes get into traffic jams just as cars...
Pictures that fool your eyes
Do you know that a \"movie" doesn't really move? Your eyes make it look as if it's moving! A movie is made with a camera that takes pictures very fast---twenty-four pictures in a second. Each...
Putting atoms to work
What makes the electricity for your home? It comes from buildings called power plants. In most places, power plants use energy from coal, oil, or gas to make electricity. But some power plants use a...
An airplane pushed by gas
Have you ever wondered why certain kinds of airplanes are called jet planes? The word jet means a stream of something that's shot out of an opening. And that's how a jet plane flies---by squirting...
Put-together things
Are your shoes made of leather? Is your sweater made of wool? Are your glasses really glass? Maybe---and maybe not. Any of these things could be plastics. But what are plastics? They don't grow as...
A machine that helps you think
> This child is using a science program on her home computer to study > fish. She can use many other programs to study different subjects. If you're an astronaut in a speeding spaceship, you have a...
More Things That Work
More Things That Work More Things That Work
