blockquote>It is no longer seriously disputed that intelligence in Homo sapiens is substantially heritable.
In the last two decades, it has also been established that obvious environmental factors such as high income, books in the house, and parental reading to children are not as potent as one might expect.
A “good enough” environment is important for the nurture of intellectual potential, but the requirements for “good enough” are not high.
Even the very best home environments add only a few points, if that, to a merely okay environment. It is also known that children adopted at birth do not achieve the IQ’s predicted by their parents’ IQ.
Charles Murray, Commentary Magazine
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