An eye for beauty locks onto faces that show signs of health and fertility - just as one would predict if it had evolved to help the beholder find the fittest mate.

In any dispute, each side thinks it's in the right and the other side is demons.

The idea that boys want to sleep with their mothers strikes most men as the silliest thing they have ever heard. Obviously, it did not seem so to Freud, who wrote that as a boy he once had an erotic reaction to watching his mother dressing. But Freud had a wet-nurse, and may not have experienced the early intimacy that would have tipped off his perceptual system that Mrs. Freud was his mother. The Westermarck theory has out-Freuded Freud.

Technology, ideology, and social and cultural changes periodically throw out new forms of violence for humanity to contend with.

People today sometimes get uncomfortable with empirical claims that seem to clash with their political assumptions, often because they haven't given much thought to the connections.

Natural selection is not the only process that changes organisms over time. But is the only process that seemingly designs organisms over time.

Why do people believe that there are dangerous implications of the idea that the mind is a product of the brain, that the brain is organized in part by the genome, and that the genome was shaped by natural selection?