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A study of chimpanzees' use of hammers to open nuts in western Africa may provide fresh clues to how tools developed among human ancestors. A paper published in the May 24 issue of the journal Science documents the first archaeological examination of a non-human primate workplace and establishes new links between the use of tools by chimpanzees and similar developments among human ancestors (hominids). The research was supported in part by the National Science Foundation (NSF).
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