Advanced Stupid

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This essay ought to exist because I keep encountering people who need an introduction to the concept.
Smart people are capable of greater stupidity.
I mean, at some level that’s all you need to know. But this is an essay and we have space and time so we should get into some followup questions.
Why does advanced stupid exist?
How do you know if you are advanced stupid?
What to do if you are advanced stupid?

recurring mistake i keep seeing smart people make is extrapolating from limited information
not so smart people cannot extrapolate very much