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. Scientists saw a group of capuchin monkeys making stone flakes, an important type of early tool. It's not clear the monkeys knew what they were making, but nonetheless, it might prompt researchers to be more cautious when they come across ancient sites where similar tools are usually attributed to early humans.
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