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May 17, 2012 09:50 am PDT

Please insert your Sir Mix-a-Lot joke here

Humans' have exceptionally rounded rear ends compared to our primate relatives. Turns out, that beefed-up gluteus maximus helps stabilize our upper body when we run, keeping us from falling forward. Read more about the biology and theoretical evolution of running at the Harvard Gazette. (Via Nicholas Thompson)


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