Gladwell is not talking about the heritability of IQ on an individual basis; he's talking about IQ differences, or the lack thereof, between races.
It's entirely possible that there is some factor of intelligence that is mostly inherited and that whites, blacks, Asians, etc., on average, possess equal amounts of this factor.
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Gladwell is not talking about the heritability of IQ on an individual basis; he's talking about IQ differences, or the lack thereof, between races.
It's entirely possible that there is some factor of intelligence that is mostly inherited and that whites, blacks, Asians, etc., on average, possess equal amounts of this factor.