9.3.26 | Gemini 3.8 Flash and Cyber, Muse Spark 1.3, opt out of training data

This is a recap of the top 10 posts on Hacker News on Sep 3, 2026.

Feel free to leave feedback on Github: https://github.com/denolfe/hacker-news-highlights

• (00:00) - Intro
• (00:19) - Gemini 3.8 Flash and 3.8 Flash Cyber
• (02:05) - Muse Spark 1.3
• (03:25) - Can I opt out of my input or output data being used for training?
• (04:38) - Three sites made 215,128 “best software” pages for AI. Perplexity cites them
• (06:12) - Google avoids a breakup of its ad tech business
• (07:39) - Biggest dark matter detector spots a single weird particle
• (08:44) - Aging brains blend memories together instead of just forgetting them
• (10:08) - Exit the Cave
• (11:22) - Fable 5.1 World Modeling
• (12:42) - Reverse Engineering Unknown File Formats with ImHex
• (13:51) - Outro

Gemini 3.8 Flash and 3.8 Flash Cyber
https://blog.google/innovation-and-ai/models-and-research/gemini-models/3-8-flash-and-3-8-flash-cyber/
https://news.ycombinator.com/item?id=49537553

Muse Spark 1.3
https://developer.meta.com/ai/models/muse-spark/
https://news.ycombinator.com/item?id=49541256

Can I opt out of my input or output data being used for training?
https://help.mistral.ai/en/articles/455207-can-i-opt-out-of-my-input-or-output-data-being-used-for-training
https://news.ycombinator.com/item?id=49535284

Three sites made 215,128 “best software” pages for AI. Perplexity cites them
https://trellner.com/reports/manufactured-sources-behind-ai-recommendations/
https://news.ycombinator.com/item?id=49536375

Google avoids a breakup of its ad tech business
https://www.nytimes.com/2026/09/02/technology/google-ad-tech-remedies.html
https://news.ycombinator.com/item?id=49537131

Biggest dark matter detector spots a single weird particle
https://www.science.org/content/article/world-s-biggest-dark-matter-detector-spots-single-weird-particle
https://news.ycombinator.com/item?id=49536079

Aging brains blend memories together instead of just forgetting them
https://studyfinds.com/aging-brains-blend-memories-together-instead-of-forgetting-them-study-finds/
https://news.ycombinator.com/item?id=49535548

Exit the Cave
https://turtlespace.blog/p/exit-the-cave
https://news.ycombinator.com/item?id=49536606

Fable 5.1 World Modeling
https://github.com/PhiloLabs/fable51-worlds
https://news.ycombinator.com/item?id=49541458

Reverse Engineering Unknown File Formats with ImHex
https://werwolv.net/posts/file_format_reverse_engineering/
https://news.ycombinator.com/item?id=49508608