WordPress plugin quirk resulted in UK Gov OBR Budget leak [pdf]

The Office for Budget Responsibility's (OBR) Economic and Fiscal Outlook (EFO) was accessed prematurely by external users before the Chancellor's speech on Budget day. The OBR's leadership is responsible for the vulnerability that occurred and was then exposed.

Why xor eax, eax?

A Linux desktop executes many xor instructions due to compilers emitting this sequence to set a register to zero, saving three bytes compared to mov instruction. The CPU optimizes this "zeroing idiom" by removing the operation from the execution queue, taking zero execution cycles.

Cartographers Have Been Hiding Covert Illustrations Inside of Switzerland's Maps

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Swiss cartographers secretly insert illustrations into official maps, defying their mandate for accuracy. These drawings, often humorous or whimsical, have been hidden in maps for decades, with some lasting up to 60 years.

Search tool that only returns content created before ChatGPT's public release

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A browser extension filters search results to exclude AI-generated content. It uses the Google search API to return results from before November 30, 2022, ensuring human-created content.

Self-hosting a Matrix server for 5 years

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The user has been hosting a Matrix server for five years using Synapse and has experienced issues with data replication, message retention, and user account management, which they believe should be handled by the server rather than scripts. They are considering switching to Snikket due to the complexity and limitations of the Matrix-Element ecosystem, particularly the new Element Server ...

The Penicillin Myth

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Alexander Fleming discovered penicillin by chance in 1928, but the story may be exaggerated or inaccurate due to inconsistencies in his account. Scientists have attempted to replicate his discovery but failed, leading to speculation about the true events surrounding the discovery of penicillin.

A vector graphics workstation from the 70s

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The user acquired a 1975 Tektronix 4051 graphics workstation, repaired it, and got it working. The machine has 32KB RAM, a Motorola 6800 computer, and can display vector graphics.

Historic Engineering Wonders: Photos That Reveal How They Pulled It Off

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Ancient civilizations developed innovative engineering solutions to shape cities, move water, and secure structures. Their achievements, such as hypocaust heating and seismic-resistant foundations, remain impressive today.

Ask HN: Who is hiring? (December 2025)

Please state the location and include REMOTE for remote work, REMOTE (US) or similar if the country is restricted, and ONSITE when remote work is not an option. Please only post if you personally are part of the hiring company—no recruiting firms or job boards. One post per company. If it isn't a household name, explain what your company does. Please only post if you are actively filling ...

Games using anti-cheats and their compatibility with GNU/Linux or Wine/Proton

Make sure to check recent updates, the game is known to break often (And the status may not update to reflect that)

It’s been a very hard year

Andy, founder of Set Studio and Piccalilli, is struggling due to a tough year with economic and political instability, affecting their business. He's asking for support to help them continue producing high-quality content and web projects that benefit people.

Netflix Kills Casting from Its Mobile App to Most Modern TVs

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Netflix removed mobile casting to most TVs and devices, directing users to use TV remotes instead. The change affects most users, except those on older devices or costlier ad-free plans.

Detection of triboelectric discharges during dust events on Mars

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Scientists detected lightning on Mars using sounds and electrical signals captured by the Perseverance rover, suggesting the Red Planet's dusty surface causes electrification. The discovery may have implications for future human-led missions to Mars and could pose a threat to rovers and astronauts.

A Love Letter to FreeBSD

The writer appreciates FreeBSD's coherence, stability, and quiet strength, comparing it to a mainframe humming in the background. They hope it stays different, earning trust with its reliability and long-term focus.

Writing a good Claude.md

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To onboard Claude into your codebase, use CLAUDE.md to define your project's WHY, WHAT, and HOW, keeping instructions to a minimum and using Progressive Disclosure to avoid bloating the context window. Avoid auto-generating CLAUDE.md and use linters, code formatters, and other features to handle implementation and formatting separately for better results.

Trifold is a tool to quickly and cheaply host static websites using a CDN

trifold is a paid service for hosting static websites with reasonable pricing and stability. It offers a cheaper alternative to services like Cloudflare Pages and Netlify with negligible storage costs.

Advent of Sysadmin 2025

Here's a step-by-step solution to fix the problem:

How to Run Profitable Pricing Experiments?

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In collaboration with our A/B testing partner Shoplift, we rolled out our first batch of pricing experiments this week. It triggered a realization that hit me like a ton of bricks: Running pricing experiments is fundamentally different from standard A/B testing. I find it problematic that most content on this topic focuses entirely on the _mechanics_—how to change a digit on a screen—while ...

Victorian-style lines for the web: Elements of identical width

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We used Inkscape to turn a 1800s border image into a repeating CSS border by separating and resizing the wreaths to create an "organic" look. The final CSS code sets the width of the element to a multiple of 22px to prevent cutoffs and allows for scaling up the repeating elements.

SmartTube Compromised

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SmartTube's digital signature was exposed and a new one has been released after a developer's computer was compromised by malware. Users should factory reset devices with the app installed and audit their Google account permissions due to potential malware exposure.

X210Ai is a new motherboard to upgrade ThinkPad X201/200

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DeepSeekMath-V2: Towards Self-Verifiable Mathematical Reasoning

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Large language models have improved in mathematical reasoning through reinforcement learning, but face limitations in verifying correct reasoning. A new model, DeepSeekMath-V2, demonstrates strong theorem-proving capabilities with self-verifiable reasoning.

Algorithms for Optimization [pdf]

This book provides a comprehensive introduction to optimization with a focus on practical algorithms for engineering design, covering various optimization topics and techniques. The book aims to equip readers with the knowledge and skills to apply optimization algorithms to real-world problems, with a focus on engineering design and applications in fields such as mathematics, statistics, and ...

Advent of Code 2025

Eric Wastl created Advent of Code, an annual programming puzzle event with varying difficulty levels. It's free to use, but not to copy, and users can participate with any programming language and skill level.

N-Body Simulator – Interactive 3 Body Problem and Gravitational Physics

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The three-body problem has no general closed-form solution and is typically studied using numerical simulation. A new simulator discovered 10,059 new 3D periodic orbits, including 21 choreographic orbits and 273 piano-trio orbits.

Google Antigravity just deleted the contents of whole drive

User needs to register or sign in with developer credentials and ensure a unique User-Agent string to access the application. Alternatively, try resetting to default User-Agent or file a ticket for assistance.

Windows drive letters are not limited to A-Z

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Windows allows drive letters outside of A-Z, but they don't appear in File Explorer and can't be navigated to due to explorer.exe's special logic. The kernel32.dll API SetVolumeMountPointW has a quirk where it truncates non-ASCII drive letters, creating a symbolic link to a different drive letter.

Engineers repurpose a mosquito proboscis to create a 3D printing nozzle

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Migrating Dillo from GitHub

Rodrigo Arias Mallo wants to migrate Dillo project from GitHub to a self-hosted server with multiple mirrors to avoid single point of failure and solve usability issues. He chose cgit as the git frontend and created a simple bug tracker software called buggy to store data in plain text.

GitHub to Codeberg: my experience

The user migrated their GitHub repositories to Codeberg, a process that took a weekend and involved setting up their profile, importing repositories, and configuring CI/CD pipelines. They also successfully migrated their website to git-pages, a service that supports uploading and hosting static websites.