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Springs (Machines in Action)
ISBN 1403440883 / 9781403440884 / 1-4034-4088-3
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Springs have been used for more than 500 years as a simple machine that can make other machines work. When you open a screen door, open an umbrella, sit on a sofa, or sleep on a mattress you are using springs. This book explains what springs are and how they help you do everyday things. Topics include: Why won't a Slinky go up stairs? How can a catapult help a place take off? How does a clock work? [via]