I can imagine it's not just restricted to scientific knowledge. And having met many of these types of people they all seem to share one trait: definitiveness.

I can imagine it's not just restricted to scientific knowledge. And having met many of these types of people they all seem to share one trait: definitiveness. Everything is black/white and there is always a "right" answer or approach where as people with little knowledge and those who are experts tend to be nuanced and flexible.