How do we explain the willingness of one person to sacrifice for another? People will put the interests of family ahead of their own. But biologist Edward O. Wilson says more important in human development has been the advancement of the group, even those members who don’t share our genes. E. O. Wilson talks about his new book "The Social Conquest of Earth." The book explores the biological roots of human culture.
This is a repeat broadcast from Wednesday, May 30, 2012, 11 am