Races are not difficult to distinguish, in fact determining self-identified race from genetic data is trivial, and genetic data is clustered in ways that reflec

Races are not difficult to distinguish, in fact determining self-identified race from genetic data is trivial, and genetic data is clustered in ways that reflect the common usage of racial categories. For example see http://www.gettinggeneticsdone.com/2011/10/new-dimension-to-principal-components_27.html http://www.gettinggeneticsdone.com/2011/10/new-dimension-to-...