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It's a shame that the suppositions in the book are based on largely unproven (though maybe not unprovable) suppositions about hominid anatomy and psychology, which would seem to render it as more of a complex "what if?" book. As I don't recall hearing about discoveries of any significant anatomical differences, specifically in brain functions, of humans pre-3000BC and humans today, I'm not sure how far a theory like this can go. But it may be a hint at other psychological aspects of humans that have are as yet poorly understood.
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