7.20.26 | I replaced a $120k bowling center system with ESP32s, Qwen 3.8, Claude Code uses Bun written in Rust

This is a recap of the top 10 posts on Hacker News on Jul 20, 2026.

Feel free to leave feedback on Github: https://github.com/denolfe/hacker-news-highlights

• (00:00) - Intro
• (00:18) - Show HN: I replaced a $120k bowling center system with $1,600 in ESP32s
• (01:52) - Qwen 3.8
• (03:11) - Claude Code uses Bun written in Rust now
• (04:43) - What I learned selling 2,500 MIDI recorders: Hardware is not so hard
• (05:57) - Claude Fable produced a counterexample to the Jacobian Conjecture
• (07:17) - Minecraft: Java Edition now uses SDL3
• (08:28) - I joined the IndieWeb, here's what I learned
• (09:39) - Orion Browser by Kagi
• (10:58) - The Zen of Parallel Programming
• (12:09) - Bananas sprout in Rayleigh Garden UK after 15 years
• (13:14) - Outro

Show HN: I replaced a $120k bowling center system with $1,600 in ESP32s
https://news.ycombinator.com/item?id=48968606

Qwen 3.8
https://twitter.com/Alibaba_Qwen/status/2078759124914098291
https://news.ycombinator.com/item?id=48966120

Claude Code uses Bun written in Rust now
https://simonwillison.net/2026/Jul/19/claude-code-in-bun-in-rust/
https://news.ycombinator.com/item?id=48966569

What I learned selling 2,500 MIDI recorders: Hardware is not so hard
https://chipweinberger.com/articles/20260719-hardware-is-not-so-hard
https://news.ycombinator.com/item?id=48966713

Claude Fable produced a counterexample to the Jacobian Conjecture
https://xcancel.com/__alpoge__/status/2079028340955197566
https://news.ycombinator.com/item?id=48973869

Minecraft: Java Edition now uses SDL3
https://www.minecraft.net/en-us/article/minecraft-26-3-snapshot-4
https://news.ycombinator.com/item?id=48967256

I joined the IndieWeb, here's what I learned
https://en.andros.dev/blog/0b8e451e/i-joined-the-indieweb-heres-what-i-learned/
https://news.ycombinator.com/item?id=48966984

Orion Browser by Kagi
https://orionbrowser.com/
https://news.ycombinator.com/item?id=48970894

The Zen of Parallel Programming
https://smolnero.com/posts/the-zen-of-parallel-programming
https://news.ycombinator.com/item?id=48907390

Bananas sprout in Rayleigh Garden UK after 15 years
https://www.bbc.com/news/articles/cvg8edqq5g5o
https://news.ycombinator.com/item?id=48968063