Former defense secretary Donald Rumsfeld said there are known knowns—things people know—known unknowns—things people know they don’t know—and unknown unknowns—things people don’t realize they don’t ...
Source LinkBarrons2021-08-19
Former defense secretary Donald Rumsfeld said there are known knowns—things people know—known unknowns—things people know they don’t know—and unknown unknowns—things people don’t realize they don’t ...
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