EDISON, THOMAS
"What is genius? According to Thomas Edison, it's 1 percent inspiration and 99 percent perspiration. By this definition, Edison certainly qualified. From childhood to the end of his long life, Edison was always working on some project. Many of them were inspirations that changed the world we live in. The incandescent electric light bulb, the phonograph, the motion picture projector-these are the mo. . . "

INDUSTRIAL REVOLUTION
"Unplug the TV and refrigerator. Everything electric has to go. Dump all the packaged food and start growing your own. Toss the store-bought soaps and shampoos. Chop some wood for the fireplace so you can cook and stay warm. Forget about school from now on: You're working dawn to dusk. Do all that and you'll see how most people lived before the Industrial Revolution. This period, which stretched from. . . "

SIMPLE MACHINES
"Which is easier: lifting a piano ten feet up in the air or pushing it up a ramp until it is ten feet from the ground. Most people whould prefer to push the piano up the ramp. Ramps, also called inclined planes, are simple machines. Simple machines are devices that make work easier. Levers, wheels, screws, wedges, and pulleys are also simple machines. Other machines - such as computers, cranes, and cars - are compound, or complex machines. They combine more than one simple machine.