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Is it easier to lift a bag full of toys with an inclined plane or a pulley? Readers will see how a group of kids compares two simple machines and decides which one does a better job.

Produktbeschreibung
Is it easier to lift a bag full of toys with an inclined plane or a pulley? Readers will see how a group of kids compares two simple machines and decides which one does a better job.
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Autorenporträt
Mari Schuh's love of reading began with cereal boxes at the kitchen table. Today Mari is the author of hundreds of nonfiction books for beginning readers, covering topics from tomatoes to tornadoes. She lives in the Midwest with her husband and still enjoys a big bowl of Honey Nut Cheerios. Learn more about her at marischuh.com.