WASHINGTON (AP) -- Chimpanzees may have been using stone "hammers" as long as 4,300 years ago, an international research team, led by archaeologist Julio Mercader of the University of Calgary, Canada, said Monday.
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Tuesday, February 13, 2007Chimps May Have Used 'Hammers' 4,300 Years Ago
WASHINGTON (AP) -- Chimpanzees may have been using stone "hammers" as long as 4,300 years ago, an international research team, led by archaeologist Julio Mercader of the University of Calgary, Canada, said Monday.
More... 
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