The survey I mentioned. It is just a survey but still significant for academics to say this
 
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.695.3163&rep=rep1&type=pdf
 
Same idea but more thorough and in regards to international differences
 
http://journal.frontiersin.org/article/10.3389/fpsyg.2016.00399/full
 
Wu and Zheng found that human races actually have more genetic variation in the brain than other parts of the body
 
http://bmcevolbiol.biomedcentral.com/articles/10.1186/1471-2148-11-16
 
And some IQ correlated genes have unequal distribution. Not all the genes we could find obviously, needs more research... but it's unlikely for it to all balance out in the end. Nature doesnt do that
 
http://www.sciencedirect.com/science/article/pii/S0160289615001087
 
Free version: http://emilkirkegaard.dk/en/wp-content/uploads/PifferIntelligence2015.pdf
 
What you do with this info is up to you. But not acting on it seems silly. You dont have to support an ethnostate of course, but I do maintain an ethnostate would be great if achieved.