top 10 hacker news stories for 2025-09-21

Quicksort explained IKEA-style

https://idea-instructions.com/quick-sort/

3 weeks ago

689 upvotes – 133 comments

They Thought They Were Free (1955)

https://press.uchicago.edu/Misc/Chicago/511928.html

3 weeks ago

602 upvotes – 503 comments

Sj.h: A tiny little JSON parsing library in ~150 lines of C99

https://github.com/rxi/sj.h

3 weeks ago

473 upvotes – 240 comments

AI was supposed to help juniors shine. Why does it mostly make seniors stronger?

https://elma.dev/notes/ai-makes-seniors-stronger/

3 weeks ago

461 upvotes – 466 comments

Meta exposé author faces $50k fine per breach of non-disparagement agreement

https://www.theguardian.com/technology/2025/sep/21/meta-expose-author-sarah-wynn-williams-faces-bankruptcy-after-ban-on-criticising-company

3 weeks ago

443 upvotes – 352 comments

Amazon to end commingling after years of complaints from brands and sellers

https://www.modernretail.co/operations/amazon-to-end-commingling-program-after-years-of-complaints-from-brands-and-sellers/

3 weeks ago

421 upvotes – 156 comments

LaLiga's Anti-Piracy Crackdown Triggers Widespread Internet Disruptions in Spain

https://reclaimthenet.org/laligas-anti-piracy-crackdown-triggers-widespread-internet-disruptions

3 weeks ago

400 upvotes – 197 comments

iFixit iPhone Air teardown

https://www.ifixit.com/News/113171/iphone-air-teardown

3 weeks ago

360 upvotes – 223 comments

Spectral Labs releases SGS-1: the first generative model for structured CAD

https://www.spectrallabs.ai/research/SGS-1

3 weeks ago

319 upvotes – 65 comments

DXGI debugging: Microsoft put me on a list

https://slugcat.systems/post/25-09-21-dxgi-debugging-microsoft-put-me-on-a-list/

3 weeks ago

287 upvotes – 86 comments
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