The belief that large segments of the population are fundamentally not good at math or science.

This one caught my eye, I don't think I've seen this listed as an obvious delusion before. Can you maybe expand more on this? I guess the idea is that a much larger number of people could make use of math or science if they weren't predisposed to think that they belong in an incapable segment?

I'm thinking of something like picking the quarter of population that scores in the bottom at a standard IQ test or the local SAT-equivalent as the "large segment of population" though. A test for basic science and mathematics skills could be being able to successfully figure out solutions for some introductionary exercises from a freshman university course in mathematics or science, given the exercise, relevant textbooks and prerequisite materials, and, say, up to a week to work out things from the textbook.

It doesn't seem obvious to me that such a test would end up with results that would make the original assertion go straight into 'delusion' status. My suspicions are somewhat based on the article from a couple of years back, which claimed that many freshman computer science students seem to simple lack the basic mental model building ability needed to start comprehending programming.