7min @voxdotcom clip - The 1850s map that changed how we fight outbreaks

text from youtube "Vox’s Phil Edwards explores Dr. John Snow’s map of the Broad Street Pump, which changed epidemiology forever. In 1854, news spread about a mysterious new cholera outbreak in London. At the time, doctors and scientists largely believed the disease traveled in a “miasma” — a floating cloud of sickness. Dr. John Snow suspected bad water might actually be the agent of transmission — and he wanted to prove it in time to stop the outbreak. Through a mix of personal interviews, clever detective work, and data analysis that included tables and a famous map, Snow managed to stop the outbreak and convince local public health officials, eventually, that cholera could be transmitted through water, not a miasma. Since his breakthrough study, the map has become an iconic piece of epidemiological history, as an illustration of keen detective work, analysis, and visual representation with a map that, even today, tells a story."