One philosophical question worth pondering is whether some things are unknowable. By definition, that which is unknowable is almost impossible to be known. Various means of knowing and understanding, embodied in sensory perception, reason, and memory, are inaccessible if a thing is unknowable. Whether something is unknowable is also firmly rooted in the present, as we cannot predict whether that which is unknowable will remain so in the future. At some point, it might become perceived and, thus, in a fundamental sense, known.
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