African Origins of Human DNA

Spencer J. Quinn writes:

What makes these recent discoveries of archaic human introgression so remarkable, however, is that they provide a reason for sub-Saharan African inferiority. Previously, the best all our neuroscientific and psychometric data could tell us was that they were inferior, but not why. Now we know why. 19 percent of black African DNA tells us they interbred at a greater rate with more primitive subspecies of archaic humans than did those Homo sapiens who left Africa.

I am ntot sure racial differences can really be attributed to genetics of 100,000+ years ago, but it is an interesting theory.