How Does It Work?
The marvels of technology are part of a child's everyday world. Here, in simple language with clear illustrations, are answers to the difficult questions children often ask about how things work-- from vacuum cleaners and cameras to magnifying glasses and tape recorders.
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air going astronaut Atoms back into words back wheel balance beam balloon float batteries bike boat bright light bubbles called camera car go carbon dioxide changes them back clock compass door electrical power electrical signals electrons filament film fizz flashlight force gear glass tube hear heat Helium invisible kernel kite light bulb liquid lock magnets attract magnifying glass mercury metal mirror moves faster music and voices needle north end notches numbers opposite poles pedals piano picture and sound plane plastic popcorn pull push radio record player refrigerator stay cold rushes signals and changes signals back silver coating soda south end space inside Space suits special kind special power store electrical strings strong engines submarine tape recorder telephone television temperature thermometer tell tiny transmitter turn them back turned into electrical vacuum cleaner wagon weigh less weight wheel with teeth wind wings wires words into electrical