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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!

Produktbeschreibung
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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Autorenporträt
Eric Braun is a children's author and editor. He has written dozens of books on many topics, and one of his books was read by an astronaut on the International Space Station for kids on Earth to watch. Eric lives in Minneapolis with his wife, two kids, and a dog who is afraid of cardboard.