text: To make matters worse, while the concept of “bio-ancestry” is supposedly central to (and the primary raison d’être of) this paper, the authors do not at all explain how they measured it in their sample! The authors simply state that the data are “available,” without explaining how the variable was measured at all. Thus the central concept of the paper remains entirely mysterious.
  So, when all is said and done, what the authors have managed to show with their (unexplained) data are: 1) there are race differences in intelligence; and 2) there are race differences in socioeconomic status. We have known both of these for at least half a century.
  Contrary to what the authors may believe, race is not a “cultural identity” or a “social construction.” Race is a biological reality, and there are real, biological, genetic differences between races in all measurable quantitative traits. I would recommend that the authors stay away from the likes of Rachel Dolezal and introductory sociology textbooks, and familiarize themselves with scientific (not sociological) literature on race and race differences. There are observable race differences among human groups, because they separately evolved in different regions of the world. Race is not a social construction or a matter of self-identity (once again, contra Rachel Dolezal).