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I'm reminded, reading about Sunstein's thoughts on echo chambers, of a truly great television moment from Aaron Sorkin's Sports Night. Angry at one of his employees for not sharing a disagreement, the editor says: "It's taken me a lot of years but I've come around to this: If you're dumb, surround yourself with smart people. And if you're smart, surround yourself with smart people who disagree with you." It'd be nice if more of us could come around to that position, too.