" A former secretary of defense had once talked about how there were known knowns—the things we know that we know, like the sky is blue and the sun rises in the east. Then there were known unknowns, like what is the cure for cancer? But there were also unknown unknowns, and these were the most dangerous: things we don’t know we don’t know. The things that came out of the blue. The things you didn’t even know you had to prepare for. "
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