21 gen 1812 anni - 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.
Aggiunto al nastro di tempo:
Data:
21 gen 1812 anni
Adesso
~ 212 years ago
