“Nothing in biology makes sense except in the light of evolution.” Few today would reject this verdict by one of the great architects of modern evolutionary theory (Dobzhansky 1973). It is now sociologists’ turn to consider the possibility that little in sociology makes lasting sense except in the light of modern evolutionary theory. For some 150 years a scientific revolution of enormous scope has been erupting with ever increasing force at the interface of the social and the biological sciences under the aegis of Darwin’s theory of natural selection and the science of population genetics. Most sociologists remain oblivious of this fact, even in view of breakthroughs in such closely pertinent areas as brain science, endocrinology, and human genetics, which clearly reveal the dramatic import of evolutionary forces for the explanation of human behavior.