Robert Trivers is a living legend in biology and the social sciences, a man the Harvard psychologist Steven Pinker calls ''one of the great thinkers in the history of Western thought" and Time magazine named one of the greatest scientists and thinkers of the 20th Century. His theories on the evolutionary tensions between parent and offspring, sibling and sibling, man and woman, friend and friend, and a person and himself or herself have not only revolutionized...