The author seems unfamiliar with the history of London but the idea is cute.
[what's wrong with plague in the 1800's? -ed]
From Fast Company:
In this latest installment, the author of "Everything Explained Through Flowcharts" (out Tuesday) travels to 19th (and 31st) century London--braving the plague, Jack the Ripper, and countless robbery attempts--to explain the 20th century's most life-changing tool.