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Heritability is not only genetic, it includes a wide variety of social factors.

Strict genetic heritability studies do not support a stong association of genetics with intelligence.

I'm curious to hear what exactly you think "twins not raised together" means.

The pre-natal environment is shared, and depending on the adoption process there could be a great deal of correlation in a range of environmental factors. It's not like these kids are grown in a vat and distributed randomly in the population is it?

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