A 10-minute tour of The Ghost Map - Steven Johnson

Description: Author Steven Johnson takes us on a 10-minute tour of his 2006 book The Ghost Map, telling the story of a cholera outbreak in 1854 London, & the famous map that physician John Snow made of the disease's path -- a map that not only convinced the world that cholera was a waterborne illness, but ultimately brought about profound changes in science, cities & modern society.