FREE: MAKE IT WORK! MACHINES

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The listing, MAKE IT WORK! MACHINES has ended.

Why do bicycles have gears? What makes a pendulum swing? How do pulleys make heavy loads lighter? Build some machines of your own and discover what makes them work -- from a popcorn dispenser and a drawing enlarger to a marble-operated clock and a real rocket!

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MAKE IT WORK! MACHINES is in the Books | Children's Books category