The second sentence is a straw man. Skimming the text, I see that's much the case throughout. Gladwell, if you look past his charming style, is extremely sloppy. Everybody who has researched IQ has come across the twin studies which amply prove that IQ is not immutable. But the only one ignoring such studies is the actual "fundamentalists" who deny that genetics has anything at all to do with intelligence.
The increase in IQ from nutrition and education is going to experience stark diminishing returns, as has already been seen.
The increase in IQ from nutrition and education is going to experience stark diminishing returns, as has already been seen.
http://www.eric.ed.gov/ERICWebPortal/custom/portlets/recordD...