"If you make a decision in your life, even one as eminently logical and self-improving as "Why'd you start washing your hair every day?" and you start getting questioned hourly about it, you're going to start second-guessing yourself."

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There is no effective difference between guessing a variable that is not random, but for which information is partial or deficient, and a random one. In this sense, guessing (what I don't know, but what someone else may know) and predicting (what has not taken place yet) are the same thing.

— Nassim Nicholas Taleb