Superb blog post demonstrating literate programming with org-mode: https://howardism.org/Technical/Emacs/literate-programming-tutorial.html (I learnt tons, you probably will too!)
miniblog.
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Steve Jobs famously asked for smooth scrolling (i.e. not line-by-line) in a Smalltalk demonstration and they changed the UI live.
Here's a lovely 2 minute YouTube video demonstrating that modification: https://www.youtube.com/watch?v=eEz08IlcNMg
This is my favourite genre of web design: simultaneously advocating for a style and demonstrating why you should/shouldn't use it!
Wonderful Strange Loop talk demonstrating Comby, a very simple parser with an elegant pattern language for large scale refactoring.
https://youtu.be/JMZLBB_BFNg