Screws

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Screws by Royston, Angela, 9781403440877
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  • ISBN: 9781403440877 | 1403440875
  • Cover: Paperback
  • Copyright: 4/1/2003

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Why is a spiral staircase easier to climb? How can a screw lift a heavy car? What is a propeller for? Screws have been sued for over 2,000 years as a simple machine that can make other machines work. When you turn a faucet on or off, ride on an airplane, or open a soda bottle you are using screws. This book explains what screws are and how they help you do everyday things.
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