In his new book, The Science of Revenge, James Kimmel Jr. argues that there is a human desire to get even – and it might even be an addiction. Kimmel Jr., a professor at the Yale School of Medicine, realized his own taste for retaliation as a teenager and later felt that he would benefit from a kind of "revenge rehab." In today's episode, the author tells NPR's Michel Martin that revenge lights up the same area of the brain activated by drug addiction. They also discuss the role of revenge in U.S. politics and the biological benefits of forgiveness.

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