> What about running? Down to race?

> running performance, on the other hand, can be measured accurately.

So do you have any science to back up your hypothesis? That certain human groups are better than others at running? And that the better performance isn't tied to geography or other environmental factors?

« any science » — What? Is that supposed to be a joke? Ever heard of the olympics? Ever seen any world-class competition, in sprint or marathon? The former is dominated by West Africans (or the descendants of the negro slaves shipped to America), and the latter by East Africans. It is clear as day.