the late Donald Rumsfeld, 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.
I found myself thinking of former Bush administration Secretary of Defense Donald ... are known unknowns. That is to say, there are things that we know we don’t know,” Rumsfeld continued.
Donald Rumsfeld ... he gave a meandering answer about the concept of "known knowns" and "known unknowns" to much public mockery. Donald Henry Rumsfeld was born in Chicago on 9 July 1932.
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