Us and Them: Understanding Your Tribal Mind : This groundbreaking and eloquently written book explains how and why people are wedded to the notion that they belong to differing human kinds - tribe-type categories like races, ethnic groups, nations, religions, castes, street gangs, sports fandom, and high school cliques. Why do we see these divisions? Why do we care about them so much? Why do we kill and die for them? This is the stuff of news headlines. How has a nation gone from peaceful coexistence to genocide? How does social status affect your health? Why are teenagers willing to kill themselves in hazing rituals in order to belong to a fraternity or social group? How do terrorists learn not to care about the lives of those they attack? US AND THEM gets at the heart of these profound questions by looking at their common root in human nature.