John Snow, also called the Father of Epidemiology (the study of the spread of disease), was an English doctor in the 1800s. A lot of people in England were getting cholera and no one could figure out why. By putting everyone who got sick onto a map, John Snow figured out that everyone who got sick lived close to an infected well. He removed the handle and new cases stopped appearing. He also studied anesthesia and sanitation systems.
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