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Wednesday, November 11, 2009 |
Wednesday, November 11, 2009 |
Photo: Did Climate Change Trigger Human Evolution?Some scientists suggest that climate changesincluding a prehistoric dry spell that may have spurred the growth of grasslands in a key African regioninfluenced the evolution of humans. Illustration by Richard Schlecht
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ADVERTISEMENTNATIONAL GEOGRAPHIC'S PHOTO OF THE DAY |
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