I normally think race mixing is fine, but this article gives me pause. I don't want to see the destruction of the races, but rather world unity, where there are like "racial bridges" formed (which doesn't mean everybody would all be the same, but there would be 40-50% mixed). I think it's up to individuals, though, and not something that should be encouraged or enforced.
From what I understand from anthropology, there are three main branches of humanity according to bone type (so it's not just skin deep): mongoloid, negroid and caucasoid. There may also be three basic hair types? Curly (caucasoid), straight/fine (asian), and "nappy" (black -- some black people use the term nappy in a positive away I've learned on the internet, it's not just derogatory b/c it can be shaped so well).
So according to this article, it suggests that blood types play a part too.
Does the Bible prohibition against mixing types of species together have to do with race? I assume not because race is not species, but the word species isn't used in the Bible. I don't have a clear memory of what I'm talking about though
(Hmm I found a page on it while editing my post:
http://www.religioustolerance.org/marracbib.htm )