This is a recap of the top 10 posts on Hacker News on Aug 9, 2025.

Ultrathin business card runs a fluid simulation
https://github.com/Nicholas-L-Johnson/flip-card
https://news.ycombinator.com/item?id=44835879

I want everything local – Building my offline AI workspace
https://instavm.io/blog/building-my-offline-ai-workspace
https://news.ycombinator.com/item?id=44840013

Jim Lovell, Apollo 13 commander, has died
https://www.nasa.gov/news-release/acting-nasa-administrator-reflects-on-legacy-of-astronaut-jim-lovell/
https://news.ycombinator.com/item?id=44840582

Ask HN: How can ChatGPT serve 700M users when I can't run one GPT-4 locally?
https://news.ycombinator.com/item?id=44840728

The surprise deprecation of GPT-4o for ChatGPT consumers
https://simonwillison.net/2025/Aug/8/surprise-deprecation-of-gpt-4o/
https://news.ycombinator.com/item?id=44839842

Getting good results from Claude Code
https://www.dzombak.com/blog/2025/08/getting-good-results-from-claude-code/
https://news.ycombinator.com/item?id=44836879

Tor: How a military project became a lifeline for privacy
https://thereader.mitpress.mit.edu/the-secret-history-of-tor-how-a-military-project-became-a-lifeline-for-privacy/
https://news.ycombinator.com/item?id=44838378

How we replaced Elasticsearch and MongoDB with Rust and RocksDB
https://radar.com/blog/high-performance-geocoding-in-rust
https://news.ycombinator.com/item?id=44836463

Astronomy Photographer of the Year 2025 shortlist
https://www.rmg.co.uk/whats-on/astronomy-photographer-year/galleries/2025-shortlist
https://news.ycombinator.com/item?id=44837434

Window Activation
https://blog.broulik.de/2025/08/on-window-activation/
https://news.ycombinator.com/item?id=44784685