In the 21st century, nearly everyone accepts that evolution has created our limbs and our livers, our hair and our hearts. Yet many people still object when evolutionary theory is invoked to explain behavior or culture.14 Even for many scientists, this position is driven by the belief that some questions should not be asked if the answers to them might be ugly. This has led to ideologically driven censorship of ideas and research programs, which has slowed the rate at which we have enhanced our understanding of who we are, and why. Some of what evolution has produced is, indeed, ugly:
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