There is an increasing (and disturbing) tendency of psychologists, biologists, and philosophers to Darwinize every aspect of human behavior, turning its study into a scientific parlor game. But imaginative reconstructions of how things might have evolved are not science; they are stories. Stephen Jay Gould satirized them as 'Just-So Stories,' after Kipling's eponymous book that gave delightful but fanciful explanations for various traits of animals ('How the Leopard Got His Spots,' and so on).