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

Ultrasonic Chef's Knife
https://seattleultrasonics.com/
https://news.ycombinator.com/item?id=45314592

$2 WeAct Display FS adds a 0.96-inch USB information display to your computer
https://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=45317527

Scream cipher
https://sethmlarson.dev/scream-cipher
https://news.ycombinator.com/item?id=45287474

FLX1s phone is launched
https://furilabs.com/flx1s-is-launched/
https://news.ycombinator.com/item?id=45312326

Designing NotebookLM
https://jasonspielman.com/notebooklm
https://news.ycombinator.com/item?id=45315312

MapSCII – World map in terminal
https://github.com/rastapasta/mapscii
https://news.ycombinator.com/item?id=45293012

Images over DNS
https://dgl.cx/2025/09/images-over-dns
https://news.ycombinator.com/item?id=45312515

Teardown of Apple 40W dynamic power adapter with 60W max
https://www.chargerlab.com/teardown-of-apple-40w-dynamic-power-adapter-with-60w-max-a3365/
https://news.ycombinator.com/item?id=45289150

PYREX 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.html
https://news.ycombinator.com/item?id=45310995

iFixit iPhone Air teardown
https://www.ifixit.com/News/113171/iphone-air-teardown
https://news.ycombinator.com/item?id=45319690