"Human nature" has meant many things to many people. Why do we do what we do? Before 1859, when Darwin published The Origin of Species, the meaning of "human nature" was anybody's guess. This book collects the first, classic tests of Darwinian theory on us -- including studies of traditional societies (from the Kung of Botswana to the Ache of Paraguay), studies of modern societies (from Hamilton, Ontario, Canada to southern California), and comparative...