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Re:Ask HN: What’s the most important modern simple invention? by nickserv on Monday February 10, 2020 @03:38PM (#22293004)
Sanitation systems are really old, though.

I was impressed with the sophistication of the one present in Glanum, a small (but wealthy) Roman provincial town abandoned in the 2nd century. The sewer system runs underneath the main street: baths, villas, and the abatoir connect to it.

To say nothing of the ones in major cities of the time.

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