I was struck by something buried in an article in the Sunday New York Times that began by noting that students who go to Princeton often marry each other. Elites, in other words, tend to marry elites. This was not exactly a world-shaking revelation. People have always tended to marry people they grow up with, work with and live among, and despite the movies, of pretty much the same socio-economic and, increasingly, educational status. But buried far down in the story was this blockbuster