Note that race refers to biological aspect not in observable physical features but rather in such genetic characteristics as blood groups and metabolic processes. Thus, Caucasian does not exclusively mean 'white' or 'European' but rather 'belonging to the Caucasian race,' a group that includes a variety of peoples generally categorized as nonwhite. Depending on how you slice it, I'm either Asian or Caucasian, or both.
Anyway, that led me to wonder about why only three ancestry types, and whether there is an actual basis for this. It is interesting that most Asian languages share some similarities, and they say that if you know Chinese it is not difficult to learn Hebrew. There appears to be three major language origins (Wifey-Pooh's into Anthropology and stuff), as well. I found this interesting.
The notion of three races and languages, suggesting three original sources of the world's cultures and peoples is fascinating. It naturally caused us to think of Genesis 7:13 and the account of Noah and his three sons.
Speaking of the Flood... the Chinese word for a ship involves eight people on a boat. Go figure, huh?