Codex starts encrypting sub-agent prompts

https://opengraph.githubassets.com/5076e01d6683eb3589adda3a93bc86f25c7f7077d0d4c0b90b90cbb4c75cefb8/openai/codex/issues/28058
The encryption in #26210 hides task/messages from audit logs, hindering debuggability. A proposed fix is adding a separate non-encrypted audit field to preserve readability while maintaining encrypted delivery.

Codex scraped the ICM website and discovered 2026 Fields Medal winner list

https://static.phemex.com/pubimg/91e4afdf8a4cf2f34d5023370f6ed7163a572ce59cd98c97ee4e9d1831df6e84.png
The 2026 Fields Medal winners list, leaked via hidden code revealing Peking University alumni Hong Wang and Yu Deng, marks the first time two Chinese mathematicians will share the award. If confirmed July 23, Hong Wang would become the third female recipient in history, a historic milestone for Chinese mathematics.

Beautiful Type Erasure with C++26 Reflection

rjk::duck uses C++26 reflection to streamline type erasure, automating vtable generation and overload resolution while supporting customization and performance optimizations like inlining. Its reflection-based design eliminates boilerplate, enabling ergonomic syntax and efficient runtime behavior in a single-header library.

Coding agents think ahead of time

https://arxiv.org/static/browse/0.3.4/images/arxiv-logo-fb.png
Coding agents' language models linearly encode program properties (e.g., test correctness) in residual streams, achieving up to 83% AUC. Probes predict future edits' outcomes 25 steps ahead and transfer across benchmarks, revealing a "latent programming horizon" and urging further interpretability research.

Proof of Care in the Age of A.I

AI's ease of content creation erodes trust in human effort, prompting people to use labor-intensive methods like handwriting, physical distribution, tattoos, and ritualistic storytelling to authentically demonstrate care and commitment.

No Spanish Reading Crisis?

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A 2025 Spanish study shows 66% of Spaniards read for pleasure, with 76% of 15-24-year-olds defying the myth that youth don’t read. Despite digital challenges, Spain’s readership has risen since 2017, contrasting with declines in the US.

Show HN: I RL-trained an agent that trains models with RL (for –$1.3k)

https://raw.githubusercontent.com/Danau5tin/ai-trains-ai/main/assets/hero.png
An AI agent trained via RL to optimize AI training using RL, open-sourcing weights, code, and GPU orchestration. It improves over 54 steps with a 0.63 reward peak, using Tinker and Prime-RL, and releases a LoRA adapter for Qwen3.6-35B-A3B under Apache-2.0.

Kids (With Phones) Are Alright

A viral video of Scottish passengers confronting a predatory drunk man highlights effective real-world bystander action and victim support, contrasting with 2026 tech policies that disproportionately target youth and reflect elite-driven, paternalistic control over digital autonomy, rooted in classist power dynamics.

Tensor Is the Might

https://zserge.com/images/tensor/tensor.png
Every good abstraction solves a problem, and this post will cover everything I know so far about a brilliant math abstraction - tensors. Neural networks, from a simple 2-layer MLP to GPT-5, all boil down to the same thing: floating-point numbers flowing through a graph of operations. This post builds a complete, accelerated tensor library from scratch in C. It is heavily inspired by Bellard’s ...

Japan develops a method to recover up to 90% of lithium from used EV batteries

https://tech.supercarblondie.com/wp-content/uploads/Japan-lithium-2-1024x525.webp
Japanese scientists developed a 90% lithium recovery method from EV batteries using lithium hydroxide, surpassing traditional 50% rates and cutting emissions by 40%. This innovation could reduce Japan's mineral imports, stabilize supply chains, and scale globally by 2035, despite current low recycling rates needing improvement.

Actegories

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Actegories are categories acted upon by monoidal categories via tensor products, modeled in Haskell using constraints and bifunctors. Examples include cartesian products and Either, leveraging associators and unitors for coherence.

Punch Yourself in the Face with Reality

In the AI era, success hinges on confronting reality by focusing on meaningful progress rather than overbuilding with AI tools, which often lead to wasted efforts. The key is relentlessly pursuing truth and impact, not escaping into AI-generated illusions.

Alternative(s) to run CUDA on non-Nvidia hardware

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Australian energy retailers must provide three hours of free daytime electricity

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From July 2026, NSW, SA, and SE Queensland households with smart meters can access three hours of free midday electricity daily via the Solar Sharer Offer, capped at 24 kWh to ensure fairness. The scheme, designed to offset solar surplus, allows renters and non-solar users to save up to $1,100/year by shifting energy use to free windows, with automation maximizing savings.

Germany set to restrict its Freedom of Information Act

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German lawmakers approved reforms to restrict the Freedom of Information Act, limiting access to individuals, raising fees, and excluding organizations, sparking criticism over transparency. Civil society and opposition warn the changes undermine public oversight and trust, with the SPD vowing to block transparency rollbacks.

The Future Worth Building Is Human

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Thinking Machines aims to build distributed, customizable AI that extends human will and judgment through continuous collaboration, prioritizing local knowledge and feedback over centralized automation. They develop interactive tools and diverse models to empower organizations and individuals, ensuring AI aligns with human values by fostering ownership, adaptability, and decentralized innovation.

The git history command

The user struggles with Git's complex parallel workflows and explores jj but finds Git's new `history` commands (fixup, reword, split) promising for painless history rewriting without switching tools. While limited by merge conflicts and stateful operations, these atomic, branch-aware features reduce the need for jj's advanced conflict handling, offering incremental improvements within Git's ecosystem.

Your 'App' Could Have Been a Webpage (so I fixed it for you)

https://bcdn.danq.me/_q23u/2026/07/http-toolkit-intercepting-640x359.png
The user reverse-engineered the Travelbound app to replace it with a webpage, criticizing its unnecessary app format, ads, and bloat. They argue web pages are more efficient, accessible, and user-friendly for simple content delivery.

Indian scientists produce most detailed 3D atlas of the human brainstem

https://ichef.bbci.co.uk/news/480/cpsprodpb/fb09/live/0e5ccbf0-79da-11f1-b976-0b9c15b0ccfc.jpg.webp
Scientists at IIT-Madras created Anchor, a detailed 3D brainstem atlas linking MRI and cellular data, offering insights into neurological disorders. By mapping 200+ cell clusters affordably, it bridges macro and micro brain studies, aiding disease research and surgery.

Notable Knot Index (2016)

Got comments, knots, requests or ideas? I'm always looking for the best knots and new knots. Contact me!

Just Let Me Write Digits

https://gendx.dev/blog/images/input-digits/screenshot-digits-fr.h6G-VpBKuN5N.webp
The Swiss AGOV login system's registration failed for the author due to a keyboard layout bug causing verification code input errors, exposing accessibility flaws. Limited support channels and delayed source code disclosure worsened the issue, highlighting challenges in digital identity systems.

The great digital fatigue: How digital burnout is changing social media use

https://blog.incogni.com/wp-content/uploads/2026/07/digital-burnout_2.png
Many users, especially younger generations, are reducing social media engagement due to mental health concerns, stress, and political polarization, with 55% posting less now than five years ago. Maintaining an online presence increasingly feels like work, causing mixed emotions, though disconnecting often brings peace despite lingering anxiety.

Building and shipping Mac and iOS apps without opening Xcode

Use Xcode's CLI tools (xcodebuild, notarytool) and XcodeGen to automate Mac/iOS app builds, avoiding Xcode GUI entirely via scripts like release.sh. LLMs like Claude Code streamline setup, handle certificate management, and generate workflows for signing, notarization, and deployment without manual GUI steps.

YouTrackDB is a general-use object-oriented graph database

https://opengraph.githubassets.com/6f044f0763da6aee0306a41b8a7568d7344ebb706f5b25903cd1b09a6dbdb968/JetBrains/youtrackdb
YouTrackDB, a JetBrains-developed object-oriented graph database, offers O(1) link traversal, ACID transactions, and supports Gremlin/YQL for queries. Join their Zulip community or use Maven/Docker for installation to leverage its production-ready, secure, and scalable design.

Fundamentals of Wireless Communication (2005)

https://web.stanford.edu/~dntse/book2.jpg
This textbook offers a unified wireless communication foundation, covering MIMO, OFDM, and CDMA with real-world examples, aimed at graduate students and engineers. It includes exercises, instructor resources, and is adopted globally by universities and institutions, with authors offering short courses.

How to build a circular LCD clock

https://blinry.org/lcd-clock/all.jpg
Built a 7-inch LCD wall clock with Raspberry Pi 3B+, featuring multi-touch, custom clock faces, and software-controlled brightness. Used HDMI/USB for connectivity, resolved power issues with official Pi supply, and added Swiss railway clock functionality with automatic day/night dimming.

Differentiable Fortran with LFortran and Enzyme

https://docs.pasteurlabs.ai/projects/tesseract-core/latest/_images/enzyme-pipeline.png
← Tesseract Blog What if you could backpropagate through existing Fortran, C, or C++ simulation code, embed it into JAX and torch, and use it as a high-performance differentiable physics engine? Turns out, you can — if you’re brave enough… Decades of validated physics code in CFD, climate, aerospace, and nuclear sit behind a wall that modern ML pipelines can’t cross, because they don’t expose ...

The Economics of Recursive Self-Improvement [pdf]

The study models AI's recursive self-improvement through feedback loops, showing current acceleration is insufficient but improving. They use elasticity-based graphs to analyze factors like algorithmic efficiency and bottlenecks, distinguishing narrow vs. broad capabilities.

An Englishwoman who sketched India before photography took hold

https://ichef.bbci.co.uk/news/480/cpsprodpb/dc75/live/53dfbcb0-75dd-11f1-b2ef-f150187f763a.jpg.webp
Emily Eden, a 19th-century British artist, captured India's diverse people and landscapes in detailed sketches during her 1830s travels, later published and exhibited in Delhi. Her work, blending colonial context with cultural observation, remains a rare artistic record of India's pre-Victorian era.
https://satellitemap.space/images/qr-code.jpg
Track satellites in real-time on an interactive 3D map. See Starlink trains, space stations, rocket bodies, and satellite passes visible from your location.