In an era of human genome research, environmental challenges, new reproductive technologies, and more, students can benefit from an introductory sociology text that is a biologically informed. This innovative text integrates mainstream sociological research in all areas of sociology with a scientifically-informed model of an evolved, biological human actor. The goal for students is to help them understand that all social phenomena are a product of the interaction of the nature of individuals with the social context and group-level phenomena never one or the other, always both. The goal is for students to better understand their emotional, social, and institutional worlds. The text also illustrates how biological understanding naturally enhances the sociological approach and how this inclusion can be done effortlessly, with little change to sociological theories and the traditional sociological foci on the importance of group dynamics, roles, norms, and culture. This grounding of sociology in a biosocial conception of the individual actor is coupled with a comparative approach, as human biology is universal and often reveals itself as variations on themes across human cultures. Tables, Figures, Photos, and the author s concise and remarkably lively style make this a truly enjoyable book to read and teach.