"Since X-factors have been empirically ruled out..." Really? Flynn himself says his explanation of B-W difference is an X-factor of sorts.
The many causes hypothesis https://abc102.wordpress.com/2011/02/17/the-many-causes-hypothesis/ … (and the many blogs of John Fuerst...)
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Can be ruled out by Rowe 2005 type modeling. But no one has bothered to replicate that.
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OK, thanks. Happen to have a link? Not finding much at first glance from Google.
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