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Absence of evidence is not evidence of absence.

there are know knowns and there are known unknowns, but there are also unknown unknowns. Thing that we don't know to don't know.

there is stuff that you don't know about but it could exist because you don't know if it doesn't exist, because you don't know about it in the first place.

there are things unkown that you know to be unknow, which means that even tho there is no evidence of them existing, you know that there is no absence of evidence that you don't know those things.

What do you know?