(...) there are known knowns; there are things we know that we know.
There are known unknowns; that is to say, there are things that we now know we don't know.
But there are also unknown unknowns – there are things we do not know we don't know." (D. Rumsfeld)
Sendo imprevísivel, quando chega, muda tudo. Mudando tudo, pode-se olhar para trás e parecerá previsível, quase inevitável. Assim tu, cisne negro, o desconhecido desconhecido.
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