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Reading The Rise and Fall of American Growth: The U. Standard of Living since the Civil War has made me think more about the unique nature of urban civilization of the long 20th-century.
The expansion of public health, in particular provision of clean water, meant that for the first time in the history of the world you had a situation where people in cities actually had a higher life expectancy than those in rural areas. We have data from the 19th century which makes it clear that morbidity was higher for city dwellers.
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And, within Africa, the dynamics were very different.But were these cities really incubators for anonymity?I would argue that the premodern city offered far less anonymity, and therefore privacy than the modern city.For the vast majority of humans then the last 60,000 years is characterized by a branching process, some reticulation (e.g., South Asians merge West and East Eurasian lineages) between these branches from a common ancestor, as well as introgression from archaic lineages like Neanderthals and Denisovans.Though I do accept that it seems that modern humans probably migrated out of Africa before 60,000 years ago, mostly due to the results from archaeology, I think the genetic evidence is strong that these groups contributed very little genetically to contemporary populations. Being conservative it seems likely that the Khoisan ancestral lineage diverged from some other Africans ~200,000 years ago.