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There's the application of multivalued logic to physics where a fact becomes not a fact any longer.

Under the old systems of physics that couldn't happen, of course—it says in the textbooks—but since it has been happening all through history, in thousands of instances, in the new systems of multivalued physics we recognize it.

Multivalued logic: expands beyond the truth and falsehood of sentences, handling the many values of the equivocal or the ambiguous.

In direct speech, we either know each other, or shall know each other to a certain extent, represented by the cumulative degrees of "I know that you know that I know that you know," defining a vague notion of knowledge within a multivalued logic.