Perhaps *A* key to high IQ. Should be repeated with larger groups of people. Still, an interesting paradigm for looking at cognitive skills that are related to intelligence.
IQ test - retest data from Scotland, ages 11 and 65 or 79 found that about 24% of variance in IQ scores could be accounted for by genetic factors; the remainder were environmental contributions. Link given to original article.
About an exceptionally gifted boy, and how the educational system in the US makes no provision for such children, even though going through a "typical" public education is not only stultifying for them, it's emotionally damaging.