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How to Move the Earth: Levers and Leverage Paperback Book

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Could a 50 pound person ever lift a 100 pound person?  Could they play on a see-saw together?  Could anyone ever move the Earth?  Let’s find out!

In this simple lesson you’ll learn all about levers, leverage, and mechanical advantage.  Experiment using a playground see-saw and a larger (or smaller) friend, and use levers to your advantage!  

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