Rumsfeld's twilight zone: Unknown unknowns

http://mprofaca.cro.net/
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As we know, there are known knowns. There are things we know we know. We also know there are known unknowns. That is to say we know there are some things we do not know. But there are also unknown unknowns, the ones we don't know
we don't know.
—Donald Rumsfeld, Feb. 12, 2002, Department of Defense news briefing

Mario Profaca
http://mprofaca.cro.net/profaca.html