I can't decide whether I hate this or agree with itpic.twitter.com/hZakziWu0c
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Something I saw a lot in school was that people would think that something that was explained to them was SUPER OBVIOUS and you'd have to be an idiot to miss the conclusion. But after talking to them, their reasoning would be wrong and could often lead to the opposite conclusion.
The actual reason the thing was true would be something relatively subtle, but the seeming obviousness of the conclusion as presented made people think they didn't need to think through the subtleties.
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