Wuuut? Only 10-15% No, no, no.... be real. When male with normal level of testosterone see hot chic his IQ is around 23-30. Racial mixing, better food, education, living conditions for sure 'rise' blacks average IQ. But this don't explain why so many blacks are niggers. With 'niggers' I mean violent, stupid, primitive, etc. person. Tomas Soweel try to 'explain' this phenomena, but in end only shit on whites. Fuck I really lose every respect for this dude. btw. Like I say IQ is jew invention, and this system is many, many times in history are abused. You can twist IQ research and then abuse statistic ( which is very easy for experts and almost impossible for average Joe to debunk ). Average nigger IQ, really? And how they chose 'average sample' of black population. Are tests tailored to achieve desired result? Which methodology is used, etc.? Because this and many other reason, serious science don't give a fuck about IQ 'research'. Only 'scientists' with agenda use it.