Via economist.com
Related posts:
Healthmap Global Disease Alert Map
Africa on Letters [Infographic]
Visualizing The U.S. Electric Grid
How Credit Scores Impact Mortgage Payments
In the Pits: Formula One Technology [Infographic]
The Colleges That Rule the Web [Infographic]
The History of the Christmas Tree [Infographic]
Google and Your Memory [Infographic]
Hot Technologies Of 2012 [Infographic]
The World's Most Exports in 2017