Git commands I run before reading any code

https://piechowski.io/post/git-commands-before-reading-code/cover_hu3f66e25b7571f7e32d40f355f31a2ca9_56928_1500x0_resize_q75_h2_box_2.webp
The user runs a series of git commands to get a diagnostic picture of a codebase, including commit history, high-churn files, and contributor rankings. This helps identify high-risk code, potential team issues, and crisis patterns, allowing the user to focus on the most critical areas of the codebase.

MegaTrain: Full Precision Training of 100B+ Parameter LLMs on a Single GPU

https://arxiv.org/static/browse/0.3.4/images/arxiv-logo-fb.png
MegaTrain is a memory-centric system that efficiently trains large language models on a single GPU by storing parameters in host memory and using GPUs as transient compute engines. It achieves high training throughput through pipelined execution and stateless layer templates.

Veracrypt project update

https://veracrypt.jp/MS_Termination.png
Microsoft terminated your account used for signing Windows drivers and bootloader without warning, preventing VeraCrypt updates for Windows users. You're considering alternative solutions, such as a signature-independent program, and seeking help from Microsoft and the crypto community.

Škoda DuoBell: A bicycle bell that penetrates noise-cancelling headphones

https://cdn.skoda-storyboard.com/2026/04/Navrh-bez-nazvu-55_c2be10ba.png
koda developed DuoBell, a bicycle bell that outsmarts noise-cancelling headphones. The bell emits sound at a frequency that ANC algorithms can't process, increasing pedestrian reaction distance by up to 22 meters.

They're Made Out of Meat (1991)

http://www.terrybisson.com/wp-content/uploads/2020/11/meathead.jpg
Aliens made of meat have been discovered and probed, but their existence is being kept secret. The aliens are trying to contact Earth, but officials advise erasing records and pretending they don't exist due to their unusual nature.

US cities are axing Flock Safety surveillance technology

https://www.cnet.com/home/security/when-flock-comes-to-town-why-cities-are-axing-the-controversial-surveillance-technology/
Flock Safety, a surveillance company, has been criticized for its AI-powered license plate cameras and data sharing practices with law enforcement and federal agencies like ICE. Cities and states are pushing back with legislation to limit the use and sharing of Flock data, and individuals can take steps to protect their privacy by being aware of surveillance in their area and advocating for change.

Audio Reactive LED Strips Are Diabolically Hard

https://scottlawsonbc.com/static/audio-led-02.gif
The user spent 10 years developing an audio-reactive LED strip visualizer that uses the mel scale to model human perception of sound and gamma correction to model human perception of light, resulting in a highly engaging and musical visualization. The project has gained over 2,800 GitHub stars and has been used by thousands of people to create unique installations and experiences in ...

Project Glasswing: Securing critical software for the AI era

https://www.anthropic.com/_next/image?url=https%3A%2F%2Fwww-cdn.anthropic.com%2Fimages%2F4zrzovbb%2Fwebsite%2F72189ac0907cf1fccf3b11553289490c41891293-250x250.png&w=256&q=75
Anthropic's Claude Mythos Preview model has identified thousands of zero-day vulnerabilities in major operating systems and software, many of which were previously unknown to developers. The model's capabilities are being shared with industry partners to help fix these vulnerabilities and improve cybersecurity.

Revision Demoparty 2026: Razor1911 [video]

Lunar Flyby

https://www.nasa.gov/wp-content/uploads/2026/04/art002e009288orig.jpg?w=1024
The first flyby images of the Moon captured by NASA’s Artemis II astronauts during their historic test flight reveal regions no human has ever seen before—including a rare in-space solar eclipse. Released Tuesday, April 7, 2026, the photos were taken on April 6 during the crew’s seven‑hour pass over the lunar far side, marking humanity’s return to the Moon’s vicinity.

Show HN: We built a camera only robot vacuum for less than 300$ (Well almost)

https://indraneelpatil.github.io/assets/img/robo_vac/robo_vac_build.jpeg
We built a robot vacuum from scratch with a laptop-based navigation system, using behavior cloning to train a CNN with expert trajectories collected through teleoperation. The robot is capable but not completely autonomous, requiring babysitting and further data collection to improve its navigation and autonomy.

Show HN: We fingerprinted 178 AI models' writing styles and similarity clusters

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The Harvard Library Passport

https://fi-le.net/stamps/images/1-arnold-arboretum-horticultural-library.jpg
The Harvard Library system has 11th largest staff and 22nd largest media collection in the world, with various locations offering a library passport program.

Ask HN: Any Interesting Niche Hobbies?

You're looking for a novel and less crowded project to contribute to, having explored various fields like AI, 3D printing, and drones.

Your File System Is Already A Graph Database

The user uses Obsidian with AI to build a personal knowledge base by collecting raw sources into a directory and having an LLM compile them into a wiki of interlinked markdown files. This system serves as a context engineering system, providing the input layer that makes every future LLM interaction better by storing meeting notes, linked decisions, and filed artifacts.

Protect your shed

https://dylanbutler.dev/images/IMG_2205.jpg
The author's career as an engineer was split between building banking systems at enterprise scale and personal projects in their backyard shed. The enterprise work taught them to engineer at scale, but the personal projects kept them an engineer and allowed them to maintain their curiosity and creativity.

System Card: Claude Mythos Preview [pdf]

Claude Mythos Preview is a large language model from Anthropic with powerful capabilities in areas like software engineering and cybersecurity. It has demonstrated a striking leap in cyber capabilities but is not being released for general availability due to potential risks.

Mario and Earendil

https://lucumr.pocoo.org/social/2026-04-08-mario-and-earendil-social.png
The author is excited to have Mario join Earendil, citing his thoughtful approach to software development and quality. They plan to invest in Pi, keeping it open and extensible, to build a better future for AI systems.

LLM plays an 8-bit Commander X16 game using structured "smart senses"

PvP-AI is a recreation of an 8-bit game I wrote back in 1990. The only traces left of the original are a few drawings and handwritten notes. Back then, writing for an 8-bit platform, it took every bit of memory and CPU to eke out 4 frames/s with the simplest of animations and backgrounds. Alas, by the time I finished it, the 1990 recession had begun, affecting many industries, including ...

GLM-5.1: Towards Long-Horizon Tasks

https://z-cdn-media.chatglm.cn/prompts-rich-media-resources/5.1-blog/20260407-235121.jpeg
GLM-5.1 is a next-generation model with stronger coding capabilities, achieving state-of-the-art performance on various benchmarks. It sustains optimization over long horizons, handling complex problems with better judgment and staying productive over longer sessions.

Native Americans had dice 12k years ago

https://media-cldnry.s-nbcnews.com/image/upload/t_fit-560w,f_auto,q_auto:best/rockcms/2026-04/260402-Early-examples-of-Native-American-dice-ew-132p-fbf33e.jpg
A lawyer-turned-archaeologist found evidence of Native Americans using dice and games of probability 12,000 years ago in the US Southwest. This discovery is thousands of years earlier than previously thought and suggests Native Americans were the first humans to contemplate complex intellectual concepts.

How to get better at guitar

https://www.jakeworth.com/twittercard.png
A guitar teacher Justin Sandercoe's technique involves transcribing songs by ear, writing down notes on tab paper as you hear them. This process helps you learn songs, develop muscle memory, and improve your ability to hear and play notes on the guitar neck.

Cambodia unveils statue to honour famous landmine-sniffing rat

https://ichef.bbci.co.uk/news/480/cpsprodpb/20f7/live/13c9f6f0-3086-11f1-932c-5f394f3ca893.jpg.webp
A statue of Magawa, a hero rat who sniffed out over 100 landmines in Cambodia, was unveiled in Siem Reap on April 4. Magawa was awarded a gold medal for his life-saving work and cleared 141,000 square meters of land during his five-year career.

Slightly safer vibecoding by adopting old hacker habits

The user's development setup involves SSHing into a server with key-forwarding and using coding agents to reduce supply-chain attack risks. By forking a development repository and using a main repository, the user minimizes risks and only loses Claude credentials in a supply chain attack.

A truck driver spent 20 years making a scale model of every building in NYC

https://th-thumbnailer.cdn-si-edu.com/v9DRXcSl0DGdbNbPEpxCYW6p8ks=/1026x684/filters:no_upscale():focal(750x500:751x501)/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer_public/b8/57/b857e0c7-ca4f-4125-8e59-aa66ff192cf3/city.jpg
Joe Macken spent 20 years building a 1,350-square-foot model of New York City using balsa wood and other materials. His model, featuring nearly a million structures, is now on display at the Museum of the City of New York through 2026.

S3 Files

https://www.allthingsdistributed.com/images/sunflowers.jpg
Amazon S3 Files integrates EFS into S3, allowing data to be accessed as a network-attached file system. This feature addresses data friction by providing a unified interface for file and object storage, making data more accessible and valuable.

Show HN: An interactive map of Tolkien's Middle-earth

An interactive map of Tolkien’s Middle-earth, with events from across the legendarium plotted as markers. The base map image is sourced from the internet and is used here for fan/educational purposes. We do not claim copyright over the map artwork. Map artwork is not owned by this project and is used for fan/educational purposes only.

Binary obfuscation used in AAA Games

https://blogger.googleusercontent.com/img/a/AVvXsEhPJQN6qeVy8lr8Rikfss5p82ORiNryYFRobl5Xunt61-vavRJxGqxlZeMWtzNsWV8MYWvIh6Ux4v-15tzmb-PX9oote0ptZ5d31jYyEkuGguWGEqQpYsJpv20IFnSL7GLflaO8jiXux8v13zhAskwEyNRXE9jOYmg1XScBXWe_9pG1LqlSVjPAlBWrdKc
You discussed a high-stakes friction point in game security: the conflict between Binary Obfuscation and Link-Time Optimization (LTO), and proposed a solution called "Apartment-Level Randomization" that respects the hardware and uses tools like LIEF, Capstone, and Valgrind. You also explored using Dynamic Binary Instrumentation (DBI) with Intel Pin as a dedicated Security Tool to detect ...

Cloudflare targets 2029 for full post-quantum security

https://cf-assets.www.cloudflare.com/zkvhlag99gkb/6siStuS5VWsIdEag8FQZkF/2e014e951328beb480468dffda783c2d/image1.png
Cloudflare is accelerating its post-quantum roadmap to achieve full security by 2029, including authentication. This is due to recent breakthroughs in quantum computing that have pulled forward the timeline for Q-Day.

Show HN: Gemma 4 Multimodal Fine-Tuner for Apple Silicon

https://raw.githubusercontent.com/mattmireles/gemma-tuner-multimodal/main/README/assets/wizard-cli.png
Gemma is a toolkit for fine-tuning on text, images, and audio on Apple Silicon Macs without renting an H100 or copying data locally. It supports domain-specific ASR, vision, and document understanding, and can be used for private, on-device pipelines.