I went through this one a few years back. I highly recommend it. His latest one is good too. In this book, the idea of a "moral matrix" was presented. He claims his research showed him that people experiencing something outside of their moral matrix was seen as evil ... kind of like why Dems and Repub's see each other as an adversary and can't see each others points Also interesting was how conservatives typically have a more "mature" moral matrix with ability to see and understand more moral "angles." A book like this is a good read if you're searching for that thing called "universal truth" as Haidt points out we all get stuck in valleys. Are you interested in other books of this nature? I can recommend others.