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Gravity Is a Mystery - Branley, Franklyn M, Dr.
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What goes up must come down. Everybody knows that. But what is it that pulls everything from rocks to rockets toward the center of the earth? It's gravity. Nobody can say exactly what it is, but gravity is there, pulling on everything, all the time. With the help of an adventurous scientist and his fun-loving dog, you can read and find out about this mysterious force.

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Gravity Is a Mystery 2007, Perfection Learning, New York, NY

ISBN-13: 9780756981037

Hardcover

Gravity Is a Mystery 2007, HarperCollins, New York, NY

ISBN-13: 9780064452014

Trade paperback

Gravity Is a Mystery 2007, Collins, New York, NY

ISBN-13: 9780060285326

Hardcover

Gravity is a Mystery 1986, HarperCollins Publishers

ISBN-13: 9780064450577

Trade paperback

Gravity is a Mystery 1986, T.Y. Crowell Junior Books, New York, NY

ISBN-13: 9780690045277

Rev edition

Hardcover

Gravity is a Mystery 1971, Random House New Zealand Ltd, Auckland

ISBN-13: 9780713612042

Paperback

Gravity is a Mystery 1970, HarperCollins Children's Books

ISBN-13: 9780690350722

Hardcover