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Those Ancient Stone Tools — Did Humans Make Them, Or Was It Really Monkeys?

October 19, 2016 5:04 PM
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Capuchin monkeys use a detached flake as an active hammerstone possibly in order to produce quartz dust.

A stone tool found in the sand has always been considered the handiwork of early humans and their ancestors. But a remarkable discovery in a Brazilian forest suggests that might not be so.

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