“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.”
Quote by Donald Rumsfeld
Author
Donald Rumsfeld
Donald Rumsfeld is a prominent American politician who served as the United States Secretary of Defense twice. Born on July 9, 1932, Rumsfeld has extensive experience in political and military affairs, leading key national security and defense policies. more
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Source: Public Statements of Donald H. Rumsfeld, Secretary of Defense, 2001
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Source: Public Statements of Donald H. Rumsfeld, Secretary of Defense, 2001
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Source: Public Statements of Donald H. Rumsfeld, Secretary of Defense, 2001
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