I suppose if some group of people got themselves into their own species, where they could not in fact mate with what we know as "human", it would be a pretty big deal.
Edit-- I quoted the same line... please feel free to respond to my comment below.
'Race' is a dumb concept. We know that there are groups of people that are biologically distinct from others. Not to say that they can't interbreed, merely that there are genetic/phenotypic differences between groups.
Skin color is obviously a biological difference that distinguishes different human populations, it just doesn't correlate with all the stuff we actually care about, for instance intelligence. 'Race' is loosely correlated with some specific biological traits, for instance http://www.webmd.com/hypertension-high-blood-pressure/guide/...
Thanks for the links. My area of (amateur) research is "contra-science," and one sub-set I find most interesting is so-called "race." What is called "race' seems actually to be the result of environmental/geographic induced gene expression. My favorite examples is a South African sub-culture that possesses the Cohen gene (Tribe of Isaiah), but looks identical to their neighbors. They have been in South Africa for about 800 years.
I suppose if some group of people got themselves into their own species, where they could not in fact mate with what we know as "human", it would be a pretty big deal.
Edit-- I quoted the same line... please feel free to respond to my comment below.