You know nothing Jon Snow

Actually, Ygritte said it more like, “YOU KNOW NUFFIN’ JON SNRRRR.”

But it’s not that Jon Snow anyway.

jonsnow

John Snow, the English Physician is kind of a rock star in epidemiology. He helped find the source of a cholera outbreak in London in 1854. By observation and interviews of affected people and those around them, he was able to trace the outbreak to a public water pump. The city soon shut it down by removing the handle and the epidemic subsided.

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