By: T.R. Slyder, TRSlyder@yahoo.com
It's by Jessica Hagy. I first saw in on the Freakonomics Blog, which I highly recommend. The blog is done by the same guys who did the book, and is a lot of fun. If you're interested in seeing more of Hagy's work, a new of these funny/clever/witty charts is published every weekday on her blog which can be found here.