The Evolution of the Human Head - Daniel E. Lieberman 

In one sense, human heads function much like those of other mammals. We use them to chew, smell, swallow, think, hear, and so on. But, in other respects, the human head is quite unusual. Unlike other animals, even our great ape cousins, our heads are short and wide, very big-brained, snoutless, largely furless, and perched on a short, nearly vertical neck. sets out to explain how the human head works, and why our heads evolved in this peculiarly human way.
In this video, Harvard University Professor of Human Evolutionary Biology Daniel E. Lieberman describes the research presented in his new book The Evolution of the Human Head.
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