Marlene Zuk is an evolutionary biologist, and the author of the new book Paleofantasy: What Evolution Really Tells Us About Sex, Diet, and How We Live. It's a cogent and funny look at common myths about human evolution. Today she's here from 12-1 PM Pacific Time to talk to you about evolution.
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I don't understand how neanderthals are considered a different species now that we know that we interbred and had viable offspring. Should that be changed?