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This is a recap of the top 10 posts on Hacker News on Dec 13, 2025.Feel free to leave feedback on Github: https://github.com/denolfe/hacker-news-highlights(00:00) - Intro (00:20) - Apple has locked my Apple ID, and I have no recourse. A plea for help (01:24) - macOS 26.2 enables fast AI clusters with RDMA over Thunderbolt (02:37) - OpenAI are quietly adopting skills, now available in ChatGPT and Codex CLI (03:42) - Koralm Railway (04:41) - Sick of smart TVs? Here are your best options (05:53) - Rats Play DOOM (06:47) - GNU Unifont (08:00) - String theory inspires a brilliant, baffling new math proof (09:11) - Show HN: I made a spreadsheet where formulas also update backwards (10:25) - Show HN: Tiny VM sandbox in C with apps in Rust, C and Zig (11:29) - Outro Apple has locked my Apple ID, and I have no recourse. A plea for helphttps://hey.paris/posts/appleid/https://news.ycombinator.com/item?id=46252114macOS 26.2 enables fast AI clusters with RDMA over Thunderbolthttps://developer.apple.com/documentation/macos-release-notes/macos-26_2-release-notes#RDMA-over-Thunderbolthttps://news.ycombinator.com/item?id=46248644OpenAI are quietly adopting skills, now available in ChatGPT and Codex CLIhttps://simonwillison.net/2025/Dec/12/openai-skills/https://news.ycombinator.com/item?id=46250332Koralm Railwayhttps://infrastruktur.oebb.at/en/projects-for-austria/railway-lines/southern-line-vienna-villach/koralm-railwayhttps://news.ycombinator.com/item?id=46242871Sick of smart TVs? Here are your best optionshttps://arstechnica.com/gadgets/2025/12/the-ars-technica-guide-to-dumb-tvs/https://news.ycombinator.com/item?id=46243655Rats Play DOOMhttps://ratsplaydoom.com/https://news.ycombinator.com/item?id=46248323GNU Unifonthttps://unifoundry.com/unifont/index.htmlhttps://news.ycombinator.com/item?id=46248859String theory inspires a brilliant, baffling new math proofhttps://www.quantamagazine.org/string-theory-inspires-a-brilliant-baffling-new-math-proof-20251212/https://news.ycombinator.com/item?id=46245622Show HN: I made a spreadsheet where formulas also update backwardshttps://victorpoughon.github.io/bidicalc/https://news.ycombinator.com/item?id=46234734Show HN: Tiny VM sandbox in C with apps in Rust, C and Zighttps://github.com/ringtailsoftware/uvm32https://news.ycombinator.com/item?id=46249538 What is Hacker News Highlights? Daily overview of the Top 10 Hacker News posts. Post and comment summarization by AI.