Today I learnt that you can do music lessons over Skype! This seems like a brilliant way of connecting students and teachers without needing to be in the same location/country/timezone.
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Today I learnt that the original name for DOS was QDOS, for "Quick and Dirty Operating System"! https://en.wikipedia.org/wiki/DOS#QDOS
(Seems rather unfortunate that they dropped the Q.)
Today I learnt that Racket *intentionally* doesn't have a traditional REPL workflow. The authors were concerned about students not understanding the state between the current session and the code on disk.
(Arguably Jupyter has some of these features now.)
https://blog.racket-lang.org/2009/03/the-drscheme-repl-isnt-the-one-in-emacs.html
Today I learnt that Emacs 28 shipped a context-menu-mode! https://oylenshpeegul.gitlab.io/blog/posts/20230129/
This seems quintessentially Emacs: deeply hackable, but building UI features in an order very different to the mainstream.