理論有可能被事實推翻

理論有可能被事實推翻係咪一個多餘ge句子? No.

A valid theory is one that can possibly be falsified, that is, it is possible that the theory can be refuted by facts, but so far no contradictory effect has refuted it.

If a statement cannot be falsified, it is a tautology (always-true statement), not a theory. A tautology has no predictive power and cannot be used to explain behaviour, scientific or human.

When things come out differently from what a theory predicts, the theory may either be refuted or qualified, meaning that the theory applies in some conditions and not others.

When things come out just as the theory predicts, the theory is confirmed once more. But bear in mind that it can still possibly be falsified.