Remember Rumsfeld’s speech about the “known knowns”, the “known unknowns”, and the “unknown unknowns”. However, he left off the most important one of all - the “unknown knowns”. As Mark Twain (may) have put it, “It ain’t what you don’t know that gets you into trouble. It’s what you know for sure that just ain’t so.”
Remember Rumsfeld’s speech about the “known knowns”, the “known unknowns”, and the “unknown unknowns”. However, he left off the most important one of all - the “unknown knowns”. As Mark Twain (may) have put it, “It ain’t what you don’t know that gets you into trouble. It’s what you know for sure that just ain’t so.”