FOR USE IN SCHOOLS AND LIBRARIES ONLY. Presents the stories behind 40 things that were invented or named by accident, including aspirin, X-rays, frisbees, silly putty, and Velcro.

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FOR USE IN SCHOOLS AND LIBRARIES ONLY. Presents the stories behind 40 things that were invented or named by accident, including aspirin, X-rays, frisbees, silly putty, and Velcro.

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