"Scientists are not supposed to believe anything. Scientists are supposed to have some evidence that leads them tentatively to some conclusion or some action. They are supposed to be able to show that to other scientists, any interested person in fact, who is willing to understand what it is that was used as evidence should be able to say 'I agree with that' 'that makes sense' while using the rules of inference we have used since Aristotle. It's not complicated at all, we learn it in the 6th grade and most scientists forget it pretty quickly. But science is not a set of beliefs. There is only one belief in science - you have to retreat to commitment at a certain point - we do believe that if A implies B and B implies C then A implies C and we do believe that if P is a proposition which is true than not P is a proposition that is false. That is all we have to believe in in science. The rest of it is tentative awaiting study...and almost every single thing that is considered to be a fact in the 20th Century will in another 200k years look very silly."
