I don’t think Diamonds hypothesis survived the first few years after publication

I don’t think Diamonds hypothesis survived the first few years after publication. And I am certain we know the reasons for developmental variation. And while a number of those reasons are politically unpleasant, they are the most important of all. And they are the reasons Diamond wrote his book to find an alternative explanation. As I’ve explained repeatedly, The differences in rates of development are trivial in cause but dramatic in effect..

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