Humankind's Most Peaceful Era?
Today's news headlines are full of violence, war and political intrigue. But from a historical perspective, we may actually be living in the most peaceful era man has ever known. In medieval Europe the murder rate was thirty times higher than it is today. And early tribal wars were nine times deadlier than the wars, and genocides, of the 20th century. We talk with psychologist and best selling author Steven Pinker about his latest work, "The Better Angels of Our Nature: Why Violence Has Declined" (Viking).