"The heritability of IQ varies, but in wealthy, industrialised countries, it approaches .80 in adults, which indicates that 80% of individual differences in IQ are associated with individual genetic differences."https://t.co/9yG8oVzJ7U pic.twitter.com/IyFjYZRjZl
— Steve Stewart-Williams (@SteveStuWill) April 15, 2026
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