Known Knowns, Known Unknowns, Unknown Knowns, Unknown Unknowns

Donald Rumsfeld in a 2002 press conference fostered the birth of the memes of “known knowns” and “known unknowns” and “unknown unknowns” which, to be frank, has long been a mystery to me. So I thought I needed to unpack it today as I can see it’s pretty important when considering the nature of black swans (versus white swans). Apparently it reaches back to the Greek era … I wish I had studied history better when I was younger.

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