wrveres wrote:"...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."
Yes, and there are also known unknown unknowns--the ones we know that we don't know that we don't know about. And don't ever forget the unknown known knowns--the ones we don't know that we know we know, but someone knows them, we just don't know them because those who are in the known knows that not all of the known knowns can be known to all of the unknowns.