Biological anthropology researchers in Â鶹´«Ã½â€™s College of Arts and Sciences have again shed new light on the very old topic of human origins. In two new journal articles appearing this week in the Proceedings of the National Academy of Sciences, the researchers report likely explanations for the evolution of human social behavior and unparalleled intelligence. The human lineage is characterized by remarkable demographic success relative to our nearest relatives and by advanced social traits such as language, empathy, and altruism. Explaining how human social behavior coul...