1. Show HN: Learn Flags Quiz (flagquizzes.com)

Free flag, capital, map and country-shape quizzes covering all 197 countries. Play instantly, no sign-up. Learn the flags you keep getting wrong.

Test your knowledge of world flags, capitals, and maps with this free quiz that covers all 197 countries. It’s a fun way to improve your geography skills without any sign-up required.

3. How Go detects struct copies with sync.noCopy (func25.dev)

If you have read the source code of the sync package, you may have noticed that several structs contain an unusual field of type noCopy, such as sync.Mutex, …

Learn how Go’s sync package uses the noCopy field to prevent unintended struct copies, which can lead to performance issues and bugs. Understanding this can help you write more efficient and safer concurrent code.

5. Prolly: A content-addressed ordered map built on prolly trees (github.com)

Prolly is a content-addressed ordered map built on prolly trees. It gives applications immutable snapshots, cheap branching, structural sharing, efficient diffs and merges, sync primitives, and ver...

Prolly offers a new way to manage data with features like immutable snapshots and efficient merging, making it ideal for applications requiring reliable data integrity and synchronization. Discover how prolly trees enhance data management in modern applications.

7. We Tracked a Shipment of Rare Books. It Ended at an Amazon AI Training Facility (www.404media.co)

We placed a tracking device in a shipment of rare books to see which AI company was buying it, and found an Amazon facility where Amazon scans and destroys books.

A shipment of rare books led to an Amazon facility where the company scans and destroys them for AI training purposes. This investigation raises questions about the ethical implications of using such materials in technology development.

8. Roboflow Playground: Try and Compare 30 Computer Vision Models (blog.roboflow.com)

We are excited to announce a tool to help you try, compare, and evaluate over 30 popular zero-shot vision models: Roboflow Playground.

Roboflow Playground allows users to experiment with and assess more than 30 popular zero-shot computer vision models. This tool makes it easy to compare their performance and capabilities in one place.

9. The only known trebuchet casualty in history (arstechnica.com)

It highlights the brutality of medieval warfare," said paleopathologist Jo Buckberry.

A paleopathologist discusses a unique incident involving a trebuchet that illustrates the harsh realities of medieval combat. This historical account sheds light on the often-overlooked human cost of warfare during that era.

13. A simple fix for LLM tail latency (engineering.myhoai.com)

Send every request twice and take the faster response.

A straightforward approach to reducing latency in large language models involves sending each request twice and selecting the quicker reply. This method could significantly enhance response times in various applications.

14. Meta faces 'astronomical' consequences as legal fight reaches critical moment (www.cnbc.com)

Meta faces a federal trial over child safety claims that could bring major financial penalties and changes to Facebook and Instagram.

Meta is on the brink of a federal trial that could impose significant financial penalties and enforce new safety regulations on its platforms, Facebook and Instagram. The outcome could reshape how the company addresses child safety concerns.

17. David Sacks on X: Some thoughts on Dario's post (twitter.com)

Some thoughts on Dario’s post:

1. Dario does not actually address Gavin Baker’s account of what he said – something he could easily deny if it were inaccurate.

2. Dario claims his critics live in a “bubble” where all regulation equals regulatory capture. He calls this an overly

David Sacks critiques Dario’s response to Gavin Baker, pointing out gaps in his argument and challenging his views on regulatory perceptions. The discussion highlights differing perspectives on regulation and accountability in the tech space.

19. Judge relying wholly on AI in order is covered by judicial immunity, court rules (reason.com)

From Wednesday's decision in Phillips v. Parlade, by Judge Gloria Navarro (D. Nev.), where a litigant sued a state court…

A recent court ruling determined that a judge who relied entirely on AI for a decision is protected by judicial immunity, highlighting the legal implications of using technology in the courtroom. The case, Phillips v. Parlade, raises important questions about accountability and the role of AI in legal proceedings.

20. We Are Forking dotenvy into dotenv-ng (secretspec.dev)

A modern Rust dotenv implementation with literal dollars, round-trip rendering, and structured parse errors.

A new Rust library is being developed to enhance dotenv functionality, featuring improvements like literal dollar support and better error handling. This could simplify environment variable management for developers using Rust.

22. Qwen3.8-27B at 256K on a 24GB RTX PRO 4000 SFF (432 GB/s): 50 tok/s with MTP (piszczek.pl)

How I built a 5.01 BPW Qwen3.8 27B hybrid, filled its 256K context, tuned MTP and gained 21.97% with a measured llama.cpp runtime.

A detailed account of building a high-performance Qwen3.8 27B model with a focus on optimizing its context and tuning for maximum throughput. The author shares specific metrics and results, making it a valuable read for those interested in advanced AI model configurations.

23. Marketers are Addicted to Bad Data (2020) (www.jacquescorbytuech.com)

Modern marketing is all about data and however hard you might try, you can't spend any time around marketers online without being subjected to endless

Marketers often rely on flawed data that can lead to poor decision-making. This article highlights the pitfalls of bad data in marketing practices and the challenges faced in overcoming these issues.

26. Design 3D-printable parts by talking (nurb.dev)

You talk to your AI. It designs the 3D-printable part while you watch. Drag sliders, download, print. No CAD software.

An AI tool allows you to create 3D-printable parts simply by talking, eliminating the need for traditional CAD software. Adjust designs in real-time with intuitive controls, making the process accessible for anyone.

27. Beware the Permanent Periphery (asteriskmag.com)

Most countries will never have frontier AI. They’re the ones who should be worrying.

Countries lacking access to advanced AI technologies may find themselves at a significant disadvantage, facing economic and technological stagnation. The implications for global inequality and power dynamics are profound and worth considering.

28. Gmail might partially be to blame for receiving emails from other Sean Conners (boston.conman.org)

Gmail might partially be to blame for me receiving emails from other Sean Conners

A user named Sean Conner discusses how Gmail’s handling of email addresses has led to confusion, resulting in him receiving messages intended for others with the same name. This situation highlights potential issues with email address management in popular services.

29. Show HN: 1667, a terminal UI for writing fiction with language models (1667.ai)

A full-screen terminal environment for writing fiction with language models. Every take stays on the tree. Your own model keys, no tracking of any kind.

A developer has created 1667, a terminal-based tool for writing fiction, tailored to their unique workflow. This interface aims to enhance the writing process by aligning more closely with their creative thought process, which resembles a branching tree of ideas.

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