Among his academic peers, Daniel Lieberman, 47, is known as a "hoof and mouth" man.
That's because Dr. Lieberman, an evolutionary biology professor at Harvard, spends his time studying how the human head and foot have evolved over the millenniums. In January, Harvard University Press published his treatise, "The Evolution of the Human Head."
We spoke in a Cambridge hotel room for three hours last winter and then again on the telephone in June. An edited and condensed version of the two conversations follows.
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