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You don't need to be Dr. Doolittle to know what a chimpanzee means when she reaches out with her hand, palm-side up. It's the begging sign, a gesture that speaks volumes even without any accompanying sound. Indeed, so evocative are the manual gestures of chimpanzees and bonobos that a team of researchers has rekindled an old hypothesis: that human language evolved from gesturing, rather than from vocal calls.


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