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We're lucky that our bodies require sleep, otherwise our cultures would have us working 16-20 hour days.
(self.showerthoughts)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. A showerthought should offer a unique perspective on an ordinary part of life.
As a grad student mostly. That said, non-tenured professors also have to work their asses off. The ~~pyramid scheme~~ dream is becoming tenured and having a large pool of grad students ~~to abuse~~ help you with your work.
I'm not sure how you feel about the limiting thing, but it is controversial in the US. Some departments do limit, others feel that isn't fair. Personally, I think we should understand why the academia system is set up the way it is and ask if it makes sense in the modern world.