In 1854, a London doctor drew dots on a map and accidentally invented epidemiology, proving that cholera wasn't spread by 'bad air' but by something far more mundane—and revolutionizing how we hunt invisible killers. John Snow's simple act of visualization didn't just solve a deadly mystery; it gave us the tools we still use today to track everything from COVID-19 to cancer clusters. Hosted by Simplecast, an AdsWizz company. See https://pcm.adswizz.com

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