Renowned moral philosopher Jonathan Glover confronts the brutal history of the twentieth century to unravel the mystery of why so many atrocities occurred. In a new preface, Glover brings the book through the post-September 11 era and into our own time-and asks whether humankind can weaken the grip war has on us.

Praise for the first edition:

It is hard to imagine a more important book. Glover makes an overwhelming case for the need to understand our own inhumanity, and reduce or eliminate the ways in which it can express itself-and he then begins the task himself. Humanity is an extraordinary achievement.-Peter Singer, Princeton University

This is an extraordinary book: brilliant, haunting and uniquely important. Almost 40 years ago a president read a best seller and avoided a holocaust. I like to think that some of the leaders and followers of tomorrow will read Humanity.-Steven Pinker, New York Times Book Review