The limitations of Twitter's design today, and how it's hard to structure conversations: https://www.theatlantic.com/technology/archive/2019/02/its-impossible-follow-conversation-twitter/582907/
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I'm a huge fan of Swift's 'Error Handling Rationale' design document: https://github.com/swiftlang/swift/blob/9315673c003875158852579bd1f33480cdec5461/docs/ErrorHandlingRationale.md#fundamentals
It carefully defines terminology and compares with other languages, so you can understand Swift's position and preference in the design space.
You can often estimate the age of a website based on how well it displays on mobile.
All my sites end up with media queries in the CSS for narrow screens. It's so hard to design a single UI that scales from phone to desktop otherwise.
"Example Driven Development" using Glamorous and Pharo Smalltalk: https://medium.com/feenk/an-example-of-example-driven-development-4dea0d995920
Tests returning values and composing is a really interesting model. It establishes structure and shows which test failure is the most 'fundamental'.