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A well planned rehash. I would be surprised if any other readers have read the 1988 book by University of Texas Professor: Richard Newbold Adams; The Eighth Day : Social Evolution as the Self-Organization of Energy. Diamond does a fine job of ripping off and popularizing a wonderful idea. The principal idea is that grain based societies as oppossed to vege-culture societies had a great advantage in warfare. (How many potatoes can you carry in your sack?) A fun read but let's have some kudos.