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Title: Makes you slap your forehead and wonder why you'd never thought of this
Review: Eg. a crop moving quickly along the same latitude, but taking a long time to traverse north/south because it would be crossing such radically different climates; or how impoverished a people can be if they are in an area with no beasts of burden to domesticate.I appreciate Diamond's expression of his opinions, neither too lengthy, nor too brief. Pat his editor on the back.
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