Humanity's ancestors traded brawn for brains, study suggests

May 28, 2014 7:57 PM

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Humanity's ancestors traded brawn for brains, study suggests

Compared to our closest primate relatives, we're a bunch of weaklings. New research suggests that our ancestors traded physical strength for brainpower.

Humans may be smart because energy once devoted to brawn was given up for brains, researchers say.

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