DTF:HN for May 21, 2026

Your Daily Tech Feed covering the top 10 stories on Hacker News for May 21, 2026. Featuring: Google officially announces that ads will be included in AI Mode search results, Show HN: Rmux – A programmable terminal multiplexer with a Playwright-style SDK, An OpenAI model has disproved a central conjecture in discrete geometry, GitHub confirms breach of 3,800 repos via malicious VSCode extension, Show HN: I reverse engineered Apple's video wallpapers, and more. Stories covered: 1. Google officially announces that ads will be included in AI Mode search results https://blog.google/products/ads-commerce/google-marketing-live-search-ads/ HN discussion: https://news.ycombinator.com/item?id=48220105 2. Show HN: Rmux – A programmable terminal multiplexer with a Playwright-style SDK https://github.com/helvesec/rmux HN discussion: https://news.ycombinator.com/item?id=48219918 3. An OpenAI model has disproved a central conjecture in discrete geometry https://openai.com/index/model-disproves-discrete-geometry-conjecture/ HN discussion: https://news.ycombinator.com/item?id=48212493 4. GitHub confirms breach of 3,800 repos via malicious VSCode extension https://www.bleepingcomputer.com/news/security/github-confirms-breach-of-3-800-repos-via-malicious-vscode-extension/ HN discussion: https://news.ycombinator.com/item?id=48207660 5. Show HN: I reverse engineered Apple's video wallpapers https://github.com/kageroumado/phosphene HN discussion: https://news.ycombinator.com/item?id=48215979 6. Haskell Foundation 2026 Update https://discourse.haskell.org/t/haskell-foundation-2026-update/14136 HN discussion: https://news.ycombinator.com/item?id=48216983 7. Vivaldi 8.0 https://vivaldi.com/blog/vivaldi-on-desktop-8-0/ HN discussion: https://news.ycombinator.com/item?id=48219060 8. New features in GCC 16: Improved error messages and SARIF output https://developers.redhat.com/articles/2026/04/28/gcc-16-improved-error-messages-sarif-output HN discussion: https://news.ycombinator.com/item?id=48188302 9. The Letter S, by Donald Knuth (1980) [pdf] https://gwern.net/doc/design/typography/1980-knuth.pdf HN discussion: https://news.ycombinator.com/item?id=48216016 10. Flipper One Tech Specs https://docs.flipper.net/one/general/tech-specs HN discussion: https://news.ycombinator.com/item?id=48212046