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    In 1854, cholera struck Broad Street in London. One scientist, John Snow, thought he could finally prove how this elusive killer spread.From our free online …

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    • On this day in 1854, Dr. John Snow pinpointed a water pump as the source of a London cholera outbreak. His pioneering work is foundational to #Epidemiology. Watch this 8-min @HarvardOnline video for the fascinating story. #MilestonesInMedicine #MedTwitter https://t.co/WSmxnV0p1y