This is a recap of the top 10 posts on Hacker News on Jul 30, 2025.

Study mode
https://openai.com/index/chatgpt-study-mode/
https://news.ycombinator.com/item?id=44725764

M8.7 earthquake in Western Pacific, tsunami warning issued
https://earthquake.usgs.gov/earthquakes/eventpage/us6000qw60/executive
https://news.ycombinator.com/item?id=44729865

My 2.5 year old laptop can write Space Invaders in JavaScript now (GLM-4.5 Air)
https://simonwillison.net/2025/Jul/29/space-invaders/
https://news.ycombinator.com/item?id=44723316

Irrelevant facts about cats added to math problems increase LLM errors by 300%
https://www.science.org/content/article/scienceadviser-cats-confuse-ai
https://news.ycombinator.com/item?id=44724238

iPhone 16 cameras vs. traditional digital cameras
https://candid9.com/phone-camera/
https://news.ycombinator.com/item?id=44723461

RIP Shunsaku Tamiya, the man who made plastic model kits a global obsession
https://JapaneseNostalgicCar.com/rip-shunsaku-tamiya-plastic-model-kits/
https://news.ycombinator.com/item?id=44728188

Learning basic electronics by building fireflies
http://a64.in/posts/learning-basic-electronics-by-building-fireflies/
https://news.ycombinator.com/item?id=44725757

ACM Transitions to Full Open Access
https://www.acm.org/publications/openaccess
https://news.ycombinator.com/item?id=44725966

Show HN: I built an AI that turns any book into a text adventure game
https://www.kathaaverse.com/
https://news.ycombinator.com/item?id=44725202

Observable Notebooks 2.0 Technology Preview
https://observablehq.com/notebook-kit/
https://news.ycombinator.com/item?id=44724068