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In 1854, John Snow (no, not the Game of Thrones character), a physician investigating cholera outbreaks in Victorian-era London, went door-to-door throughout the streets of Soho neighborhood asking local residents where their drinking water came from. He discovered that cholera was much more common in areas where residents drank unfiltered water that had been pumped from the river Thames. In 1858, a record-breaking heat wave caused the water level of the Thames to drop, and it became clear from …