O.k Feng here is my opine. I see no evidence that a white man's head is more vulnerable to death hand strike blows than Asians. Basically every races bone structure is EXTREMELY similar. I have heard of some scientists claiming that sub-Saharan Africans hip sockets have a minor difference to other races, but when Jon Entine is the biggest proponent/ writer about this I don't know whether to believe there is any significant difference. Length of limbs or height are the main noticeable difference other than skin color. Of course there are minor differences in muscle/ tendons and the way facial features like noses look. But I have read it's a fact that it takes significantly longer for evolution to change bone structure than skin color, height and limb length etc. Also, it would be nearly impossible to strike a man in the nose with incredible force once with your palm and kill them to my knowledge. And most good fighters would be good at defending cheap shots to the back of the head, to the temple and palm nose strikes. MMA is fairly realistic- other than no eye gouging, headbutts, groin shots, knee strikes to the head on a grounded opponent, but any race would be very vulnerable to savage strikes like that in a real fight and you are most vulnerable when you are on the ground. That's where most real fights end unless a guy takes a big knockout strike. BTW: Fedor seems to be the best heavyweight MMA fighter ever. In boxing both Klitchkos should wind their careers down as top 10 Heavyweights of all time- along with Rocky Marciano from the days of old- whether the media likes it or not. Eastern Europeans like Vatali and Wladamir weren't exposed to the caste system like white Americans were post Marciano. I have seen Asians that are "VERY ELITE" fighters too, but most are middleweights or lighter. Of course there are some exceptions. I actually think Asians and Caucasians have many athletic similarities, but Caucasians are usually a bit bigger. I posted previously about some possible Asian advantages and Caucasian ones.- I am still somewhat of a novice on MMA fighter and boxer reporting, but this is just my 3 cents.