taw comments on Review: Selfish Reasons to Have More Kids - Less Wrong
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Also, twins share their uterine environment.
This wouldn't apply to IVF twins reared apart, but I doubt there's much of that in the studies.
Why's that relevant, when the question is what parents can change by how they treat their children? (It would be highly relevant if the question were "how much of these differences are genetic?", but on this occasion it isn't.)
Caplan's arguments are totally wrong, it doesn't make his thesis wrong. I'd expect his thesis to be very likely to be at least mostly correct.