In The Long Term The Scientific Process Works.

"Indeed, I’ve argued that one red flag identifying a crank or a quack is a hostility towards the very concept of a scientific consensus."

"It’s also important to remember that there are scientific consensuses and then there are scientific consensuses. What I mean is that some consensuses are stronger than others, ---"

http://www.sciencebasedmedicine.org/on-the-right-to-challenge-a-medical-or-scientific-consensus/