On Human Nature is a 1979 Pulitzer prize-winning book by the Harvard biologist E. O. Wilson. The book tries to explain how different characteristics of humans and society can be explained from the point of evolution. He explains how evolution has left its traces on the characteristics which are the specialty of human species like use of sex for pleasure, generosity, self-sacrifice and worship. The book is considered as an effort to complete the Darwinian revolution by bringing biological thought into social sciences and humanities.