Paleoarchaeologists working in Kenya have unearthed the oldest known stone tools found to date, and say that they predate our earliest known ancestors by over half a million years.

Digging by accident at a site they didn’t originally intend to visit, Sonia Harmand and Jason Lewis of Stony Brook University in New York, found stone tools that they’ve dated to 3.3 million years ago, 700,000 years older than previously found artifacts. Anthropology professor Alison Brooks, George Washington University, has examined some of the tools. "It really absolutely moves the beginnings of human technology back into a much more distant past, and a much different kind of ancestor than we’ve been thinking of."
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