Estimates of historical world population - Wikipedia
[https://en.wikipedia.org/wiki/Estimates_of_historical_world_population] - - public:mzimmerm
Series of 23 lectures about Ukraine
27 BCE: Augustus changed Roman Republic to Roman Empire.
Vaccines and other basic research history, good.
Henry Kissinger interview about history, politics, Ukraine, China
Good analysis of Russia - Full history
One of the best historical analysis of Ukraine and Russia
Monitor and delete history of Google searches.