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  • Editorial: Known Knowns, Known Unknowns, and Unknown Unknowns

    …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 that we do not know. But there are also unknown unknowns – the ones we don't know we don't know…and…it is the latter category that tend to be the difficult ones.

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