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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 is a strange and handsome man who has written dozens of books for kids and teens, sometimes while wearing a hat. He lives in Minneapolis with his wife and sons and gecko. Learn more at www.heyericbraun.com
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