The novelist Joseph Conrad expressed a great truth when he said: "The mind of man is capable of anything--because everything is in it, all the past as well as the future," Our evolutionary history of noble acts and foul deeds, leading to survival and reproduction, guarantees that we understand the most essential facets of our physical and social environment. The nature of our struggles--our lusts, our fears, our objectivity, our irra-tionality--lies embedded in our cellular DNA and the neurons of our mind, there to play itself out much like it did in the past and much like it will in the...