Former U.S. Defense Secretary Donald Rumsfeld famously introduced into the American lexicon the oxymoronic concept of the “known unknown”—“that is to say we know there are some things we do not know.”1)See Michiko Kakutani, Rumsfeld’s Defense of Known Decisions, N.Y. TIMES (Feb. 3, 2011), http://www.nytimes.com/2011/02/04/books/04book.html?pagewanted=all&_r=1& (reviewing DONALD RUMSFELD, KNOWN AND UNKNOWN: A MEMIOR (2011)). A…