We absolutely must leave room for doubt or there is no progress and no learning. There is no learning without having to pose a question. And a question requires doubt. People search for certainty. But there is no certainty.
Progress in science comes when experiments contradict theory.
We are trying to prove ourselves wrong as quickly as possible, because only in that way can we find progress.
A scientist is never certain. ... We absolutely must leave room for doubt or there is no progress and there is no learning.
It is the facts that matter, not the proofs. Physics can progress without the proofs, but we can't go on without the facts ... if the facts are right, then the proofs are a matter of playing around with the algebra correctly.
If we will only allow that, as we progress, we remain unsure, we will leave opportunities for alternatives.