Ironically this is exactly how the cause of cholera was discovered. Some savvy bloke mapped the locations of all the cholera victims in London, noted most of them were in a few tight clusters, walked to the geographic center of all those clusters, and behold there was a communal well that was notably shallower than normal at all of them. Shallow enough that shit-water could leach down through the ground to it.
And this is why we have modern sanitation and arent dying from cholera anymore thanks to England.
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