research, I've discussed this topic and your link with jason malloy over email, the last time he requested for a reader for collaboration on China's IQ, but I stopped corresponding with him after a while because I was busy(maybe you are him?). FWIW, Taiwan mostly comprises Fujian people; Hong Kong comprises Cantonese, some US Chinese are Cantonese. Here is a link in Chinese(you can try google translate, but it's not very good):http://hi.baidu.com/oxygen1024/blog/item/0c1f35d110dd4b389a502788.html  
 
I've copied the following text, whose source may be "IQ of Southern Chinese and Northern Chinese at AsiaFinest's", but I'm not sure. 
 
" Its a series of acadmic papers therefore I can not link them, however you can google (using google scholar): ???2???, ??, ??, 2005, ???, the research is funded by Chinese government (Department of Public Health, ???) in 2005, to study the health of people/the iodin situation in China, the IQ study is just part of it, since they dont intend to comapre the IQ between provinces therefore they publish their study provincely. 
 
I post some contents from their paper: the results: in their study they use Raven's IQ test set: 
 
Zhejiang province: country-side, male: 116.23 
?Zhejiang province: Urban/country side together: male: 115.82 
?115.05/Zhejiang province: overall together (male and female): 115.05 
??Zhejiang province: Hangzhou city: 114.7 
??Zhejiang Province: country-side: female: 114.41 
??Zhejiang Province: female overall: 114.32 
??Beijing: Urban and country-side: 114.07 
??Beijing: Urban only 112.6 
?? 
??Hubei Province overall average: 105.3 
Hubei Province city-only average: 111.1?? 
Jilin Province overall average: 107.04 
?Jiangsu Province overall average: 111 
Liaoning Province overall average: 107.9 
?Sichuan Province overall average: 105.3 
?Guangdong Province overall average: 103.4 or 101.1 depend on the value of the Flynn factor (The Guangdong data is obtained later therefore there is a Flynn effect). 
Xinjiang Province: 95 
Tibet: 85 
 
So based on their data you can see, other than the two minortiy-provinces Xinjiang and Tibet, Guangdong has the lowest mean IQ in their study, much lower than even the poorest provinces such as Sichuan. " 
 
I may look into the reports later and feedback here. Maybe AG can help first.

Gc, why don't we genetically modify someone to have a huge brain? Since the correlation of brain size to intelligence is approx 0.4, why don't we try to do something like that irl? Isn't that a much better idea than AI? I think it'll be easier trying to find out the biological causes of intelligence first. Stphen Hwking says that last time, we were limited by the size of the birth canal, now by C-sections. I wonder too if huge brains have evolved in the past, like for example in dinosaurs.

Don't want to sound narcissistic here, but did you take the idea of 'apotheosis of the nerd' from me? If so, please acknowledge it, thanks.

WTF? I thought square jaws indicated testosterone?

What're the effects of diet on cranial volume?

I use caffeine to relieve, temporarily, an idiopathic slowness of thought and constant tiredness. I've developed a tolerance to it though, and don't know what other things I can do to help myself.