9.21.25 | Ultrasonic Chef's Knife, $2 WeAct Display FS with 0.96-inch USB display, Scream cipher

Hacker News Highlights · Sep 21, 2025 · 12m

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…