The Story of London's Most Terrifying Epidemic -- And How It Changed Science, Cities, and the Modern WorldMost of this book is a medical thriller that explains how a physician named John Snow became convinced that cholera was spread by contaminated water. He was instrumental in containing the 1854 outbreak in London by demonstrating a correlation between the number of deaths and one particular water pump. The "ghost map" of the book's title refers to a map prepared by Snow to support his thesis.
At the time Snow's views were ridiculed in The Lancet because they did not agree with the prevailing theory, which was that disease was spread by "miasma," or foul smells. Today he is considered one of the fathers of epidemiology.
This part of the book is a swift and fascinating read.
City Planet
The author goes on to make a number of provocative observations about the world today. In the middle of the 19th century, rural populations outnumbered urban ones, and life was safer in the country than in the city. Today, those two trends have been reversed, and humans have become a predominantly urban species. Surprisingly, urban life is more environmentally friendly than rural life.
Our evolution into a planet of cities could be derailed by a number of threats, but chief among them is the chilling prospect of asymmetric warfare.


