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Donald Rumsfeld quote: There are known knowns; there are things we know we...
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  • 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
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    Donald Rumsfeld during Department of Defense News Briefing, archive.defense.gov. February 12, 2002.
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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
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