Primate origins, human origins, and the end of higher taxa.
When people learn that I study human evolution and we start talking about it, they sometimes ask me, "How long ago did the first humans live?" My answer is usually another question: "What do you mean by 'humans'?" That response seems as baffling and wrong-headed to them as their question seems to me, and it usually takes us a while to straighten things out. © 2012 Wiley Periodicals, Inc.
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