Via Datablog at The Guardian: John Snow's data journalism: the cholera map that changed the world. Excerpt:
How often does a map change the world? In 1854, one produced by Doctor John Snow, altered it forever.
In the world of the 1850s, cholera was believed to be spread by miasma in the air, germs were not yet understood and the sudden and serious outbreak of cholera in London's Soho was a mystery.
So Snow did something data journalists often do now: he mapped the cases.Click through for the full story and some modern applications of Snow's kind of data mapping.
