Alas, the Wikipedia article you kindly linked to is an example of the point-of-view pushing that goes on too much on Wikipedia in relation to the topic of human intelligence.
It's going to be a long, long, LONG time before Wikipedia will come close to correctly representing what the most reliable sources say about time trends in IQ in national populations, about the relationship of genetic factors to the development of human intelligence, or about most related subjects.
For a reliable source on the subject you are curious about, see Intelligence, Genes, and Success: Scientists Respond to THE BELL CURVE
http://en.wikipedia.org/wiki/Wikipedia:Arbitration/Requests/...
It's going to be a long, long, LONG time before Wikipedia will come close to correctly representing what the most reliable sources say about time trends in IQ in national populations, about the relationship of genetic factors to the development of human intelligence, or about most related subjects.
For a reliable source on the subject you are curious about, see Intelligence, Genes, and Success: Scientists Respond to THE BELL CURVE
http://www.amazon.com/Intelligence-Genes-Success-Scientists-...
with articles by several expert statisticians, geneticists, and psychologists.