There's a scientific meaning behind the word race - geographically isolated population groups, or more precisely groups that do not interbreed. Humans don't have those, and never have had those. I never said we were homogenous, any nitwit can see that most people in Asia have black hair, and there's no reason to think that only superficial physical characteristics sort geographically. Just that, there aren't distinct races. You know, a middle ground, as proposed by the guy who wrote that first article you linked to, at the end.