Glad you enjoyed the essays. On LaTeX - I sometimes cut-and-paste screenshots, but usually just write raw LaTeX or pseudo-LaTeX (i.e., something LaTeX-like that wouldn't compile, but is easier to read). It'd be much, much better to use some kind of plugin that turned it into images, but I've been too lazy to try.

This has, incidentally, made many of my matrix-based Anki cards rather ugly. I'll probably update a bunch of answers with cut-and-paste from this essay.

Not to put too fine a point on it, but it's pretty bad I'm using raw LaTeX in this way - I'm sure it hurts my understanding! On the other hand, I've written so much LaTeX over the years that reading it seems really natural.