by Charles Q. Choi, Live Science Contributor | May 20, 2015 02:08pm ET Sammy Lokorodi, a resident of Kenya's northwestern desert who works as a fossil and artifact hunter, led the way to a trove of 3.3 million-year-old tools. Credit: West Turkana Archaeological Project View full size image The oldest handmade stone tools discovered yet predate any known humans and may have been wielded by an as-yet-unknown species, researchers say. The 3.3-million-year-old stone artifacts are the first direct evidence that early human ancestors may have possessed the mental abilities needed to figure out how to make razor-sharp stone tools. The discovery also rewrites the book on the kind of environmental and evolutiona
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