Malcolm Gladwell has written a timely article on IQ, specifically about the Flynn effect, which is described thusly:
He collected intelligence-test results from Europe, from North America, from Asia, and from the developing world, until he had data for almost thirty countries. In every case, the story was pretty much the same. I.Q.s around the world appeared to be rising by 0.3 points per year, or three points per decade, for as far back as the tests had been administered. For some reason, human beings seemed to be getting smarter. Flynn has been writing about the implications of his findings—now known as the Flynn effect—for almost twenty-five years.
Needless to say, the implication of Flynn’s research is that if IQ is increasing so rapidly from generation to generation, it can’t be described as innate.
I’d recommend reading the whole article, not only is Gladwell’s argument interesting, but he includes plenty of entertaining anecdotes that are worth the price of admission. The explanation of achievement by Chinese immigrants to America is particularly good.