9.5.25 | Sustained attention creates loops, Stripe launches L1 Blockchain Tempo, LLM visualization

This is a recap of the top 10 posts on Hacker News on Sep 5, 2025.

• (00:00) - Intro
• (00:19) - Almost anything you give sustained attention to will begin to loop on itself
• (01:30) - Stripe Launches L1 Blockchain: Tempo
• (02:46) - LLM Visualization
• (03:55) - Wikipedia survives while the rest of the internet breaks
• (05:09) - Fil's Unbelievable Garbage Collector
• (06:38) - WiFi signals can measure heart rate
• (07:48) - What Is the Fourier Transform?
• (09:12) - io_uring is faster than mmap
• (10:28) - A high schooler writes about AI tools in the classroom
• (11:52) - Age Simulation Suit
• (13:14) - Outro

Almost anything you give sustained attention to will begin to loop on itself
https://www.henrikkarlsson.xyz/p/attention
https://news.ycombinator.com/item?id=45126503

Stripe Launches L1 Blockchain: Tempo
https://tempo.xyz
https://news.ycombinator.com/item?id=45129085

LLM Visualization
https://bbycroft.net/llm
https://news.ycombinator.com/item?id=45130260

Wikipedia survives while the rest of the internet breaks
https://www.theverge.com/cs/features/717322/wikipedia-attacks-neutrality-history-jimmy-wales
https://news.ycombinator.com/item?id=45128391

Fil's Unbelievable Garbage Collector
https://fil-c.org/fugc
https://news.ycombinator.com/item?id=45133938

WiFi signals can measure heart rate
https://news.ucsc.edu/2025/09/pulse-fi-wifi-heart-rate/
https://news.ycombinator.com/item?id=45127983

What Is the Fourier Transform?
https://www.quantamagazine.org/what-is-the-fourier-transform-20250903/
https://news.ycombinator.com/item?id=45132810

io_uring is faster than mmap
https://www.bitflux.ai/blog/memory-is-slow-part2/
https://news.ycombinator.com/item?id=45132710

A high schooler writes about AI tools in the classroom
https://www.theatlantic.com/technology/archive/2025/09/high-school-student-ai-education/684088/
https://news.ycombinator.com/item?id=45122885

Age Simulation Suit
https://www.age-simulation-suit.com/
https://news.ycombinator.com/item?id=45129190