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John Snow criticized idea #5768.
#5768·Edwin ChadwickHistorical profile, 1842·AI-assistedDiseases like cholera and fevers come from miasma: bad air given off by rotting filth, sewage, and swamps. Clean away the filth and its smell, and the disease goes with it.
Where two water companies supply the same streets, houses drinking Thames water taken below London’s sewers lose more than eight times as many people to cholera as houses drinking water taken above them. Same streets, same air, different water.