On: What are Differential Equations and how do they wo...

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xkcd #557: https://xkcd.com/557/

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Several people have commented about having this nightmare. In the American university system, bad things happen if you fail a course?

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Not just American, nightmares about school are very common among adults from all places: https://www.psychologytoday.com/us/blog/freedom-learn/201606...

Anecdotically, I have this kind of nightmare at least once a year and I'm from Chile.