An argument that the “expanding circle” historical thesis ignores instances in which modern ethics narrowed the set of beings to be morally regarded, often backing its exclusion by asserting their non-existence. (30 mins.)
Illustrates why we live in the most peaceful time ever in history, by looking at what motivates us to behave violently, how these motivators are outweighed by our tendencies towards a peaceful life and which major shifts in history caused this global reduction in violence. (Book — 834 pages)