Ask HN: Favorite In-Depth Deep Dives

What are your favorite in-depth deep dives into a less-known topic, which is also something that can spark interest for a field? Non-computing preferred. I recently had the pleasure of stumbling over the following:

The Story of Titanium - https://www.construction-physics.com/p/the-story-of-titanium - how it became useable.

https://dynomight.net/p2p-meth/ - a deep dive into the recent history of meth production and what changed about it, really fascinating stuff.

Design for 3D-Printing - https://blog.rahix.de/design-for-3d-printing/ - an in-depth list of tricks and tips to shape printed items well.

https://www.noctua.at/en/expertise/blog/how-can-it-take-so-long-to-release-black-fan-versions - an insight into the design process of a high-precision injection moulded product.

Anything else? I'd love to have some sunday-read worthy items lined up which spark curiosity and teach lesser-known but fascinating insights.