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In this August 2012 photo provided by Marta Mirazon Lahr, researcher Frances Rivera, right, Michael Emsugut, left, and Tot Ekulukum excavate a human skeleton at the site of Nataruk, West Turkana, Kenya. This skeleton was that of a woman, found lying on her back, with lesions on her neck vertebrae consistent with a projectile wound. She also had multiple fractures on one of her hands. Writing in a paper released Wednesday, January 20, 2016, by the journal Nature, scientists said it�s one of the clearest cases of violence between groups among prehistoric hunter-gatherers. (Photo by Marta Mirazon Lahr via AP Photo)
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