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Continue to ChatHumans needed water or they would die, but dirty water killed as surely as thirst. You had to boil it before you drank it. This culture around tea was a way of tiptoeing along the knife edge between those two ways of dying. - Neal Stephenson from https://whatsmyquote.com/quote/humans-needed-water-or-they-would-die-but-dirty-water-killed-as-surely-as-thirst-you-had-to-boil-it-before-you