PAPER: Further proof of biological diversity within humans; 'Genetic correlates of social stratification in Great Britain'

Even in a relatively very short span of time, hard selection can push for observable and big biological variation within humans. The above paper (Abdellaoui et al. [2019]) shows that, in industrial England, more intelligent persons moved out to London from colliery towns, and the less intelligent stayed where they were. In not more than 16 generations, groups differentiate.