Genetic borders are usually linguistic borders too

Note the awesome correlation between the two maps below. The first map is mine. I posted it on this blog almost a year ago (see here). The second map is from the recent Wang et al. preprint (see here). Also note that the Steppe and Caucasus clusters as defined by Wang et al. are rich in Y-haplogroups R1 and J, respectively (see here).





Very cool indeed. But I'm still scratching my head and