This is true but usenet and mailing lists were a way to scale your professor's office hours. Which is to say that they were good at telling you to solve the precise thing you are struggling with, while simultaneously asking "what don't you get about this?!"https://twitter.com/katzmandu/status/982262800956383233 …
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Sometimes I think about Évariste Galois, who effectively invented a form of algebra that was decades ahead of its time, all by the young age of 20. He also did this while desperately in love, and subsequently died in a duel because of those feelings. I will never be that smart.
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Seriously though, I cannot stress enough how ahead of its time Galois theory was. It took decades to fully explore its impact. It turned a problem that had been standing for 350 years on its head. It is, today, the topic of advanced graduate courses.
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Galois' proof of the non-solvability by radicals of the general quintic is so brilliant that it almost makes me want to shift to become an algebraist. It's what Erdős may have called a "proof from The Book."
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(I should actually look up if he said that) Galois' proof came chronologically after the results by Abel and Ruffini, so we still call the proof the Abel-Ruffini Theorem today. But their solution was a sledgehammer and Galois' was artful.
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It's interesting that the Abel-Ruffini Theorem implicitly comes up in data science all the time and we don't ever realize it. A consequence of the result is that the eigenvalues of a general matrix of degree 5 or greater cannot be computed non-iteratively.
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End of conversation
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Good luck to the future generations who have to figure out that books are on disks and how to decode them.
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Also books: Water will destroy us.
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I feel so much better about my huge book collection now. Seriously, digital forms of knowledge are way more susceptible to damage and degrade much faster than paper.
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What isn't said is that it took 300 years to discover the proof the first time.
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