Monday, 15 October 2007

Rumsfeld on the unknown

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, 12 Feb 2002, Department of Defense news briefing

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