By 40 kya, at least 4 subpopulations of modern humans lived in Eurasia (Yang et al. 2017)

Over at Current Biology at this LINK. Summary: By at least 45,000 years before present, anatomically modern humans had spread across Eurasia [1, 2, 3], but it is not well known how diverse these early populations were and whether they contributed substantially to later people or represent early modern human expansions into Eurasia that left no surviving descendants today. Analyses of genome-wideSource via Eurogenes Blog