Epic of Gilgamesh and Gilgamesh keywords, chrono sorted, duplicates out, a three hour tour? A three hour tour?
Imagine the sewage and stench that these 80k people produced with their minimal sanitation abilities. I know that the infant death rates must have been horrendous! these start-up civilizations, to which we owe a great debt, got their start in the areas that could benefit from organized agriculture, which is why the 3 centers were in China, Indus River and this 'Fertile Crescent'.