Low key the cornerstone of modern civilization. Imagine a city where the streets are awash in millions of people’s shit/piss, the water is heavily contaminated, and everyone is constantly getting fecal-oral diseases and cannot work or be healthy much of the time. Even when they are healthy, they might have to stay home and take care of sick family members.
Sewage systems are the big one I think.
Low key the cornerstone of modern civilization. Imagine a city where the streets are awash in millions of people’s shit/piss, the water is heavily contaminated, and everyone is constantly getting fecal-oral diseases and cannot work or be healthy much of the time. Even when they are healthy, they might have to stay home and take care of sick family members.