DTF:HN for May 20, 2026

Your Daily Tech Feed covering the top 10 stories on Hacker News for May 20, 2026. Featuring: Everything in C is undefined behavior, Learnings from 100K lines of Rust with AI (2025), Gemini 3.5 Flash, FiveThirtyEight articles on the Internet Archive, I’ve built a virtual museum with nearly every operating system you can think of, and more. Stories covered: 1. Everything in C is undefined behavior https://blog.habets.se/2026/05/Everything-in-C-is-undefined-behavior.html HN discussion: https://news.ycombinator.com/item?id=48203698 2. Learnings from 100K lines of Rust with AI (2025) https://zfhuang99.github.io/rust/claude%20code/codex/contracts/spec-driven%20development/2025/12/01/rust-with-ai.html HN discussion: https://news.ycombinator.com/item?id=48205415 3. Gemini 3.5 Flash https://blog.google/innovation-and-ai/models-and-research/gemini-models/gemini-3-5/ HN discussion: https://news.ycombinator.com/item?id=48196570 4. FiveThirtyEight articles on the Internet Archive https://fivethirtyeightindex.com/ HN discussion: https://news.ycombinator.com/item?id=48201973 5. I’ve built a virtual museum with nearly every operating system you can think of https://virtualosmuseum.org/ HN discussion: https://news.ycombinator.com/item?id=48195009 6. Japan is gripped by mass allergies. A 1950s project is to blame https://www.bbc.com/future/article/20260515-the-1950s-blunder-which-causes-mass-hay-fever-in-japan HN discussion: https://news.ycombinator.com/item?id=48202047 7. Infomaniak transitions to a foundation model to protect user data privacy https://news.infomaniak.com/en/infomaniak-foundation-sovereign-cloud/ HN discussion: https://news.ycombinator.com/item?id=48203536 8. Google changes its search box https://blog.google/products-and-platforms/products/search/search-io-2026/ HN discussion: https://news.ycombinator.com/item?id=48197370 9. Show HN: Forge – Guardrails take an 8B model from 53% to 99% on agentic tasks https://github.com/antoinezambelli/forge HN discussion: https://news.ycombinator.com/item?id=48192383 10. Remove-AI-Watermarks – CLI and library for removing AI watermarks from images https://github.com/wiltodelta/remove-ai-watermarks HN discussion: https://news.ycombinator.com/item?id=48200569