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Pulling Up
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Audio Engineering and the Science of Soundwaves
Bok av Anne Rooney
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DO-4U the Experiences Force and Motion
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Scholastic Discover More: The Elements
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The Simple Science of Motion
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Pressing Down : The Lever

Bok av Gerry Bailey
Pressing Down explores the benefits and uses of the lever. RobbO and RobbEE learn how a lever can be formed in three different ways to do different kinds of worklift and lower, separate, and open.