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RE: Alles zweifelhafte muss angezweifelt werden.
Donald Rumsfeld sagte am 12. Februar 2002 auf einer Pressekonferenz:
„[T]here 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 – there are things we do not know we don't know.“ (Donald Rumsfeld)