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Capuchin monkeys use a detached flake as an active hammerstone, possibly in order to produce quartz dust. M.Haslam/Nature hide caption

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

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Two white-headed capuchin monkeys (also known as the white-faced capuchin or white-throated capuchin) on Gorgona island, off Colombia's Pacific coast. AFP/Getty Images hide caption

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AFP/Getty Images