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Wheels and Cranks

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What would the world be life if we didn't have wheels? How do you think the ancient Egyptians moved huge stones to build the pyramids? Why does a mountain bike have such thick knobby tires? How do you think toys moved before batteries were invented? This title shows you how different kinds of these two simple machines are all around you to make your work and play easier.

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Wheels and Cranks
2006, Heinemann Educational Books, North Mankato

ISBN-13: 9781403485977

Trade paperback

Wheels and Cranks
1996, Heinemann Educational Books, North Mankato

ISBN-13: 9781575720814

Hardcover

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