yeah, but the old world.
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Even in the old world, the Himalayas and the Sahara were pretty discrete borders. Hence the sharp phenotypic difference btwn China & India.
End of conversation
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@hbdchick point nicely made here. Although they add obligatory disclaimer.http://journals.plos.org/plosgenetics/article?id=10.1371/journal.pgen.0010070 …Thanks. Twitter will use this to make your timeline better. UndoUndo
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