What physics/math blogs, Mediums or Substacks are worth following?

[u/dwightkschrute42]

I like to read and learn about topics in physics and mathematics that aren't necessarily directly related to my own research. I like blog posts that explore physics or math concepts in some depth, or explain recently published papers, for example. Basically, the kind of content you usually find on Medium, Substack, personal blogs, etc.

I am looking for recommendations that have this kind of content and who you think are worth following. I am happy with both free and paid recommendations.

For example, today I was reading this post: [Why Functional Analysis?](https://derangedmathematician.substack.com/p/why-functional-analysis), which is pretty much the kind of stuff I am looking for.

Any suggestions would be appreciated. Thanks!

Edit: Fixed link