John Snow knew something😁 His mapping of clusters of cholera cases in the Soho, London epidemic narrowed the source to the Broad Street water pump and helped to save lives. https://t.co/eMYqFFbQj6
— Vicky Veritas (@morganssong) March 17, 2020
via Twitter https://twitter.com/morganssong
March 17, 2020 at 08:18PM
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