I have a theory about "dumb blonde syndrome", the idea that beautiful women are dumb. Folk psychology says that everybody gets the same number of character points to distribute among their attributes, so some people get intelligence while others get beauty. But reality says that beauty is correlated with <edit>health</edit>, which is correlated with intelligence. Beautiful people should tend to be smart. I think there is some positive beauty/intelligence correlation.

But I remember taking a class with a stunningly beautiful woman, who every week would loudly make some inane comment or question, and not realize it was inane because no one would tell her so. And I developed the theory that beautiful people don't learn to self-censor, because they don't need to. Anybody else would get ridiculed when they said something stupid, and learn to be more shy.

Maybe this also applies to smart people. They're more likely to be correct, and so less likely to be made fun of when speaking their mind, and so less needful of learning how to phrase a question in a way that reduces their chances of being made fun of.