Sometimes the most important things are things we don't even want to think about, let alone talk about.

The issue of handling and removing human waste and dirty water is one such problem that is confronted human since the dawn of time.

The elimination of waste and excess water

was one of the fundamental things which allowed cities to grow all over the world.

Learn more about sewers. Yeah, I'm doing an episode on Sewers.

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Sometime around the year 2008, the world passed a significant milestone.

That was the point when more than half of the population in the world lived in urban areas.

And this wouldn't have been remotely possible if it wasn't for sewers.

The problem of dealing with human waste was something that humans had to deal with since humans became human.

When we were just hunter-gatherers, it probably wasn't that big of a deal.

Because you moved around

quite frequently you just had a set of simple rules like go away from the camp, don't go near

the water and don't get eaten by a lion. Once humans settle down and lived

in permanent settlements waste became a much bigger problem.

You had to do something with it.

One option was to dig a hole and let the hole fill up.

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