Anthropologist and Primatologist, Richard Wrangham, explains how humans selectively bred ourselves to become less aggressive and how our capacity for violence informed the evolution of morality and our sense of right and wrong.
Two advertisements: one for Athletic Greens offering a free year's supply of vitamin D and 10 travel packs, and another for House of Macadamias offering 20% off along with a year's supply of vitamin D and 10 free meals a day travel packs.