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In a 2009 photo provided by the Dikika Research Project shows two parallel cutmarks made by stone tools on the rib of a cow-sized mammal. The discovery in Ethiopia of two cut-marked bones provides the oldest known evidence of tool use and meat eating by human ancestors. Dated to 3.4 million years ago, they are nearly a million years older than any previously known cut-marked fossils. (AP Photo/Dikika Research Project)

In a 2009 photo provided by the Dikika Research Project shows two parallel cutmarks made by stone tools on the rib of a cow-sized mammal. The discovery in Ethiopia of two cut-marked bones provides the oldest known evidence of tool use and meat eating by human ancestors. Dated to 3.4 million years ago, they are nearly a million years older than any previously known cut-marked fossils. (AP Photo/Dikika Research Project)

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