Is It All In Our Genes?

Is It All in Our Genes?Why do young women want older men?Why do kids need stay-at-home moms?Why is monogamy doomed to fail?Why are guys so wild?Robert Wright is holding forth on the subject of chimpanzee testicles when an attractive young waitress approaches the table. He freezes midsentence and waits in awkward silence. Only when she is out of earshot does he resume speaking.You would think Wright would be used to raising eyebrows. His latest book, The Moral Animal, about the field of evolution...