1 ene 1854 año - John Snow

Descripción:

The scientist John Snow had been claiming that cholera was carried in water or food and could be ingested. Colleagues have dismissed his idea. A cholera epidemic has broken out in London, in an area around a water pump. Snow takes a sample of the water from the pump and through a microscope finds it contaminated. He removes the pump's handle and the cholera comes to a quick end.

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