21 Jan 1812 Jahr - John Snow (1813-1858) was an English Epidemiologist and best known for his work about cholera. In his time people thought that cholera was a problem from the air-borne. He did an investigation and also made a water pump map. Without his investigation, people will suffer from cholera. He concluded that cholera was spread through water and not the air.
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Datum:
21 Jan 1812 Jahr
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~ 212 years ago
