Since the point they make repeatedly is that we are all an amalgam of many peoples many time over, even the negritos they mention, I fail to see how this is a statement that races exist. It is abundantly clear to any reasonable observer that there may have once been races of humans but now there is only one, the human race.
Anytime the NY Times says Lewontin or any other lefty was wrong about anything, it's big news.
DNA says you are wrong. There is unquestionably more people that are "mixed-race" than ever before, but it will be hundreds of years before humanity is sufficiently genetically "homogenized" to be considered a single race, if ever.
If one is beta blocker candidate, it matters.
We are the human species, with many local variants called races.
Virtually any species with a wide geographic distribution will have races, except for a few like dandelions.
Races increase the survival potential of a species.
Take the test:
http://www.alllooksame.com/frameset-register.html
Korean, Japanese, or Chinese. Do they all look the same?