Quotations
A year of unknowns
People made fun of it at the time, and long afterwards, but it's a nice way of expressing a very important distinction.
"As we know, 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."
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