Just over two and a half million years ago, our brains swelled. Less than a million years later, they swelled again, our posture and our gait changed, our jaws shrank, and we grew taller. These two evolutionary changes define our species, distinguishing us from our fellow primates.
Richard Wrangham has new ideas about why these changes occurred. He has no argument with the generally accepted wisdom that our first transformation – from nimble tree-climbing australopithecines… Continue
Posted on October 6, 2009 at 2:42pm