Teaching students effectively by predicting the errors they will make: https://news.harvard.edu/gazette/story/2013/04/understanding-student-weaknesses/
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Bril is a cute intermediate language for teaching (think simplified LLVM IR): https://www.cs.cornell.edu/~asampson/blog/bril.html
The idea of providing a standard JSON format to help students write basic passes is really elegant.
An interesting feature of the Grok TiddlyWiki interface: it has the sidebar on the right.
I see a sidebar on the left way more often, but arguably it makes more sense on the right for a wiki? The content is effectively more prominent.
https://groktiddlywiki.com/read/
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