A look at the history of altruism, over the past 12,000 years, which contends that we're not designed to be kind, but can push ourselves to be kind anyway, together.

Michael E. McCullough is a Professor of Psychology at the University of California, San Diego. As an experimental psychologist interested in the social dimensions of human life, he conducts research on topics including altruism, forgiveness, gratitude, self-control, religion, and morality, for which he has received numerous distinctions. He is the author of a number of books including Beyond Revenge: The Evolution of the Forgiveness Instinct.