You know Weiji, it's kind of funny being condescended to by you, and told to 'learn something', at the same time as being reminded to be polite. It's all the more odd since it seems doubtful that you've ever studied cognitive science or evolutionary genetics. Perhaps you feel you have the moral high ground. Maybe you should think about approaching this delicate subject neutrally and scientifically, rather than selecting 'reliable sources' which confirm your bias.
Marks is a well known egalitarian apologist, with about as much credibility as Gould. My summary of his 'argument' is accurate (well perhaps I should have written general intelligence instead of IQ (quicker), but the point is clear). If you want I can break it down into words of one syllable. Is this one of the 'reliable sources' you keep admonishing us to use?