In Michael Ghiglieri, a biologist and protege of Jane Goodall, takes on one of the most highly charged debates in modern science: the biological roots of bad behavior. Beginning with rape, and moving on to murder, war, and genocide, Ghiglieri offers the most up-to-date, comprehensive look at the male proclivity for violence. In a strong narrative voice, he draws on the latest research and his own personal experiences -- both as a primatologist and as a soldier -- to explain that male violence is largely innate, a product of millions of years of evolution. In the process, he debunks many of our most clung-to, "politically correct" notions: that the differences between men and women are strictly due to socialization, that rape is really about power -- not sex -- and that genocide is only possible with a single madman at the helm. Well-argued, evenhanded, yet never dull, this important book illuminates the darkest impulses of the male psyche, and suggests ways for modern society to curb them.