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Hey, dudes! Skateboarding is my thing, but when barbarians invade my castle, I have to defend myself. Watch me launch a water balloon with a lever and lower a key with a pulley. Roll with me and find out how simple machines simply rock!
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Eric Braun has written more than one hundred books for kids and teens, including many about sports. He coaches youth baseball and soccer, has two sports-loving sons, and has suffered many disappointments as a lifelong fan of the Minnesota Twins.
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