1+1=2 is true in one descriptive context called "decimal number system"
1+1=2 is false in another descriptive context called "binary number system"
Modernism is the meta-descriptive context that scientists hold to when they are acting as scientists. Mathematicians , I understand, are post-modernist and pragmatic about number bases by which I mean mathematicians choose a particular number base according to who uses that number base or the purpose for which it's being used.
'Facts' is a concept applied to the modernist meta-descriptive content but not the array of postmodern descriptive contexts.Within the modernist descriptive context academic disciplines each has its own formula for ascertaining whether or not a concept is a fact.
I'd like to explore the connection, or alternatively the difference, between post modernism and the metaphysical view of the eternal now. I think it's safe to say while postmodernism is about how we can and can't know, the eternal now and all its infinite contents is about what nobody knows but which would be rather nice nevertheless.