Mrebo said:

twooffour said:
Making a prediction that if I let go of my pencil, it'll drop to the floor, is a fact;

A prediction is not a fact. And that's a fact, not my opinion. But let us not take another 7 pages to fail to convince you on this point.

I'm not sure which terms scientists, or epistemologists use in this context, but yes, in everyday speech, the "fact" that if you jump out of the 9th floor, you'll fall to the ground, and "might" get a headache, is, indeed, a "fact".

Or at the very least a "certainty", which is what this is all about anyway, isn't it?