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Did you see a flagpole today? Then you’ve seen a pulley at work! These simple machines are all around. Take a look inside and discover 13 different uses for pulleys.
Wiley Blevins is an author living in New York City. He has written more than 75 books for children and 15 for teachers. He taught elementary school in both the United States and South America, and has recently been in TV commercials for a children's television channel in Korea.
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