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Product Description: The earliest humans understood matter on a very basic, practical level. Through trial and error they determined which rocks could make good spearheads and good pounding or grinding stones. The Bronze Age began about 2000 BCE when rocks containing copper and tin were heated together...read more

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9781448847006 | Rosen Pub Group, August 15, 2011, cover price $35.60 | About this edition: The earliest humans understood matter on a very basic, practical level.

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