IQ and Heritability
The hereditary component of IQ has a long and controversial history. Arun has a link to some of the story from Cosma Shalizi.
Interesting (or not) as that story may be, it starts becoming irrelevant if genes linked to IQ are found. If there aren't any, then the statistical studies showing such heritability must be flawed. If there are, then the question becomes substantive: how and how much? What interventions are possible and are they desireable?