5021109
9781403485953
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How are a boat propeller, water faucet, and spiral staircase alike? How can a screw keep your soda pop from getting flat? How can a screw help you plant a tree? Why might a large wrench work better than a small one? This title shows you how different kinds of these simple machines are all around you to make your work and play easier.Glover, David is the author of 'Screws', published 2006 under ISBN 9781403485953 and ISBN 140348595X.
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