Put Screws to the Test

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Put Screws to the Test by Walker, Sally M.; Feldmann, Roseann, 9780761378686
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  • ISBN: 9780761378686 | 0761378685
  • Cover: Paperback
  • Copyright: 8/1/2011

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What do jar tops and water-bottle lids have in common? Both of them are screws! Screws are simple machines. They help us to do jobs more easily. But dont take our word for it. Put screws to the test with the fun experiments youll find in this book.