Errol Morris made the rounds last week to plug his documentary, The Unknown Known, about Donald Rumsfeld. In Rumsfeld’s famous press-conference response, Rumsfeld talked about known knowns, known unknowns, and unknown unknowns. From what I can remember, Rumsfeld didn’t mention the fourth combination, the unknown known. Errol Morris uses this fourth combination as the title for the doc, and goes into the background in a post on NYTimes.com.

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