Beyond that: All science is, is questioning.

You CANNOT "prove" anything in science. All you can do is reject the null hypothesis.

"Thus we cannot say for certain that X, in fact, does absolutely nothing" is the strongest golden standard of result in science. It is hedged bets upon hedged bets. It's the theory of gravity, because who knows, it might be wrong! Maybe it doesn't work like we think it does! (And then when we get down to sub-particle physics... it doesn't! So we were right to keep it as just a generally useful theory rather than 100% accepted law.)