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This is a recap of the top 10 posts on Hacker News on Sep 21, 2025.Feel free to leave feedback on Github: https://github.com/denolfe/hacker-news-highlights(00:00) - Intro (00:22) - Ultrasonic Chef's Knife (01:27) - $2 WeAct Display FS adds a 0.96-inch USB information display to your computer (02:39) - Scream cipher (03:50) - FLX1s phone is launched (05:01) - Designing NotebookLM (06:11) - MapSCII – World map in terminal (07:13) - Images over DNS (08:28) - Teardown of Apple 40W dynamic power adapter with 60W max (09:39) - PYREX vs. pyrex: What's the difference? (10:45) - iFixit iPhone Air teardown (11:59) - Outro Ultrasonic Chef's Knifehttps://seattleultrasonics.com/https://news.ycombinator.com/item?id=45314592$2 WeAct Display FS adds a 0.96-inch USB information display to your computerhttps://www.cnx-software.com/2025/09/18/2-weact-display-fs-adds-a-0-96-inch-usb-information-display-to-your-computer/https://news.ycombinator.com/item?id=45317527Scream cipherhttps://sethmlarson.dev/scream-cipherhttps://news.ycombinator.com/item?id=45287474FLX1s phone is launchedhttps://furilabs.com/flx1s-is-launched/https://news.ycombinator.com/item?id=45312326Designing NotebookLMhttps://jasonspielman.com/notebooklmhttps://news.ycombinator.com/item?id=45315312MapSCII – World map in terminalhttps://github.com/rastapasta/mapsciihttps://news.ycombinator.com/item?id=45293012Images over DNShttps://dgl.cx/2025/09/images-over-dnshttps://news.ycombinator.com/item?id=45312515Teardown of Apple 40W dynamic power adapter with 60W maxhttps://www.chargerlab.com/teardown-of-apple-40w-dynamic-power-adapter-with-60w-max-a3365/https://news.ycombinator.com/item?id=45289150PYREX vs. pyrex: What's the difference?https://www.corning.com/worldwide/en/products/life-sciences/resources/stories/in-the-field/pyrex-vs-pyrex-whats-the-difference.htmlhttps://news.ycombinator.com/item?id=45310995iFixit iPhone Air teardownhttps://www.ifixit.com/News/113171/iphone-air-teardownhttps://news.ycombinator.com/item?id=45319690 What is Hacker News Highlights? Daily overview of the Top 10 Hacker News posts. Post and comment summarization by AI.