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There are known knowns:
there are things we know that we know.
There are known unknowns:
that is to say, there are things that we now know we don’t know.
But there are also unknown unknowns:
there are things we do not know we don’t know.
— Rumsfeld D. (2002) Press Briefing
via Don’t listen to successful people • Intense Minimalism.
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