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Brain surgery also has multiple other extremely challenging dimensions to it that the others don't even touch. Time sensitivity. Ability to kill people - now of course rocket science can do this too, but it's a lot more delayed. It's not something you feel the pressure of right in the moment, while you do your work. Brain surgery isn't just knowledge, you need to have steady hands, really good mood regulation. Like you can't really have an "off day" as a brain surgeon. I have mad respect for math and intellectual skills, but whatever brain surgery might lack in comparative intellectual difficulty, it makes up for with like. Everything else about it