Human Nature's Pathologist

Psychologist at Harvard University, Stephen Pinker, says that over time humans have become less violent. He states that there were considerably more murders and violent deaths in the past and that in the future it can be expected that this trend will continue. Pinker believes that this is due to evolutionary psychology and the ways our brains have changed throughout history.

http://www.nytimes.com/2011/11/29/science/human-natures-pathologist.html?pagewanted=1&_r=1&ref=evolution