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eBook, 2015
Current format, eBook, 2015, , Available.
eBook, 2015
Current format, eBook, 2015, , Available. Offered in 0 more formats
Which works better to haul a pumpkin-a lever or wheels and axles? Readers will see how a group of kids compares two simple machines and decides which one does a better job at moving the pumpkin. This book supports engineering design standards for primary grades in the Next Generation Science Standards.
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