A few days ago, I published an interactive map of American migration on Forbes.com. Since then, it's become more popular than I could have possibly imagined. It's been shared 5,000 times on Facebook and written about in The Economist, three different New York Times blogs, three different Atlantic blogs, and basically the entire "-ist" franchise (Gothamist, Chicagoist, DCist, and so on)--plus 1,700 other blogs and publications of various sorts. To say I'm grateful for the...
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