邦訳：2015年・青土社（上下巻）New in paperback. Hardcover was published in 2011. This groundbreaking book continues Pinker's exploration of the essence of human nature, mixing psychology and history to provide a remarkable picture of an increasingly nonviolent world. The key, he explains, is to understand our intrinsic motives - the inner demons that incline us toward violence and the better angels that steer us away - and how changing circumstances have allowed our better angels to prevail.