Chinese from Hong Kong and southern China are going to be closely related to Chinese from the north, Koreans and Japanese. This is really a non-issue. How are BLL's taken in Hong Kong circumstantial evidence to BLL's for those people? Hong Kong has an average IQ of 106 and has been high for many years. The children exposed to lead in 1987 are the adults today. Even if IQ were not taken with the data on BLL's, we see societies with high lead having high IQ. (Yes, I understand IQ wasn't taken with BLL, but average IQ is compared to average BLL, and I am not arguing BLL does not affect IQ) Again, my argument isn't high prenatal, neonatal and childhood lead levels do not affect IQ, but that the data from Hong Kong challenges your assumptions on one cause of Black and White IQ differences. Here are more sources on higher heavy metal levels in East Asia: http://www.tandfonline.com/doi/abs/10.1080/09603123.2013.769204 Taiwanese BLL's averaged 8.10 - 8.99 ug/dL; but the article concludes BLL's were not significantly higher than most developing and developed nations. http://www.ncbi.nlm.nih.gov/pubmed/7843836 Taiwan, Korea, and Hong Kong are societies with both higher lead levels and higher IQ than any White population. So you have correlation data between body size and brain volume? You're simply making an assumption. Until you have the data showing positive correlation between body size and brain volume I won't take your word for it. I also am amused you would think average body size differences exist between blacks and whites to a sizeable degree. I will not do your homework for you. If you do not show the degree to which brain volume and body size are correlated, and the gap in black-white body size, I will neither reject, qualify or modify the data. The incoherence of your argument is telling. You are assuming environmental factors you do not bother to quantify are potential causes for the brain volume gap, but do not offer explanation how the sub-region of one part of the brain in fact was larger for blacks than for whites. How could the environment cause all but one regions of the brain in blacks to shrink, but for the orbitocortex to be larger? How does the orbitocortex being larger in blacks than whites support the position of no racial brain volume differences?