Trivers's ideas have rippled out into anthropology, psychology, sociology, medicine, even economics. His work provided the intellectual basis for the then-emergent field of sociobiology (now better known as evolutionary psychology), which sought to challenge our conceptions of family, sex, friendship, and ethics by arguing (controversially) that everything from rape to religion is bred in the bone through the process of evolution. The linguist and Harvard psychology professor Steven Pinker calls Trivers ''one of the great thinkers in the history of Western thought.''
Now his decades-long absence-what Trivers's friends and colleagues refer to as his ''fallow period''-finally seems to be ending. In 1994 he left Santa Cruz (''the worst place in the country,'' he now calls it) for Rutgers, and this spring he's back at Harvard as a visiting professor of psychology. A major new book on genetic conflicts within individual organisms, coauthored with Austin Burt, a geneticist at Imperial College London, is due out next spring from Harvard University Press. And thanks to Brockman-agent to some of the biggest names in science-he's under contract with Viking Penguin to write a popular book on the evolutionary origins of deceit and self-deception, one that will argue that humans have evolved, in essence, to misunderstand the world around them. Trivers thinks it could be the most important topic he has yet studied.