We began as savages, and savagery has served us well--it got us where we are. But how do our tribal impulses, still in place and in play, fit in the highly complex, civilized world we inhabit today? This question, raised by thinkers from Freud to L vi-Strauss, is fully explored in this book by the acclaimed anthropologist Robin Fox. It takes up what he sees as the main--and urgent--task of evolutionary science: not so much to explain what we do,...