Conversation

I've skirted the boundary of "no patience for fools", but I have noticed that people even fractionally more intelligent lose it VERY fast.
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At some point, people get annoyed at not being able to convey their thoughts. Communication practice of different kinds helps, but...
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... high IQ people past that point also grow massively overrepresented in asperger's and other social disorders, so good luck with that.
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I spent far too much time reading about psychometrics when I was 16/17. Lots of well-established findings on this already.