Scientists have unearthed more than 350 ancient tools in Konso, Ethiopia that were used by humans' ancient ancestors. The tools, which span roughly 1 million years of evolution, show a gradual ... more 
Scientists have unearthed more than 350 ancient tools in Konso, Ethiopia that were used by humans' ancient ancestors. The tools, which span roughly 1 million years of evolution, show a gradual progression to more refined shaping. less 
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LiveScience.com | Photo By PNAS
Mon, Jan 28, 2013 3:30 PM EST