The old Greeks knew what the Norse and Chinese and every other ancient culture knew, a fact we are learning now: War drives humans mad. And war is the greatest crime, for it brings all other crimes surging in its wake. And war could well destroy our world like it has destroyed so many of our culture worlds. But we seem unable to stop doing it. Therefore "What shall we think of war?" is the most perplexing question of human life. But perhaps it can be understood. Perhaps war is a parasitic self-replicating meme living in the information ecosystem of human history. (This is a thought older than Thucydides but cast in current terms of supposition.) That is to say, war may be a kind of infestation in our cultures not inherent to our human nature. Indeed, some historians now claim, with ample evidence they say, that there have been broad sweeps of land where for several thousand years humans did not war. So perhaps this insanity can be cured somehow. Can there be an age of history after war?