Show HN: A game where you build a GPU

How many products does Microsoft have named 'Copilot'?

You tried to explain Microsoft Copilot but found multiple uses of the name, leading to confusion. You created a map of all 75+ Copilots, grouped by category, but couldn't find a pattern.

OpenScreen is an open-source alternative to Screen Studio

https://raw.githubusercontent.com/siddharthvaddem/openscreen/main/public/preview3.png
OpenScreen is a free app for making product demos and walkthroughs, offering basic features without the cost of Screen Studio. It's open-source and free for personal and commercial use, but may require terminal commands for macOS setup.

Embarrassingly simple self-distillation improves code generation

https://arxiv.org/static/browse/0.3.4/images/arxiv-logo-fb.png
A large language model can improve at code generation using its own raw outputs through simple self-distillation, which fine-tunes the model on its own samples. This method improves model performance on harder problems and generalizes across different model scales and variants.

LLM Wiki – example of an "idea file"

Show HN: sllm – Split a GPU node with other developers, unlimited tokens

Shared LLM access via cohort subscriptions

Show HN: I made open source, zero power PCB hackathon badges

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You designed zero-power hackathon badges for the Overglade hackathon in Singapore using RP2040, NFC, and e-ink. The boards are easy to set up and manufacture, with costs starting at around $100 for 5 units.

Ruckus: Racket for iOS

https://ruckus.defn.io/images/app-icon.png
01 Execute Racket programs and see output as it's produced. Everything runs locally on your device. 03 Understands Racket forms like define, let, and cond. Includes a keyboard row for brackets and common keywords. 06 Run scripts from your home screen or automate them with Shortcuts. Opens .rkt files from Files.

Show HN: TurboQuant-WASM – Google's vector quantization in the browser

https://opengraph.githubassets.com/28a40e3ef792eedf7862d2adbe6783abb9bfc9e488d0efac328d5f34aaade3ff/teamchong/turboquant-wasm
TurboQuant is a vector compression library that achieves near-optimal distortion rate with ~4.5 bits/dim compression. It supports fast dot product and decoding without decompression.

Apple approves driver that lets Nvidia eGPUs work with Arm Macs

https://platform.theverge.com/wp-content/uploads/sites/2/2026/04/HEy9-blbAAABy-J.jpg?quality=90&strip=all&crop=0%2C22.4%2C100%2C77.6&w=2400
Apple is allowing a driver to be signed, eliminating the need to disable System Integrity Protection. The driver is designed for LLMs and can be compiled with Docker.

The Indie Internet Index – submit your favorite sites

https://deliciousreverie.co.uk/images/default-share-card.png
The user shares various personal websites and projects, including a schedule maker, game websites, and indie internet index. These websites showcase a range of topics, from education and games to art and personal projects.

German implementation of eIDAS will require an Apple/Google account to function

The Wallet Unit provides authentication means bound to multiple identification means via public/private key pairs, ensuring resistance against attackers with high attack potential. The solution monitors identified vulnerabilities for the HKS and operating system of user devices through a mobile device vulnerability management (MDVM) during operation.

Components of a Coding Agent

https://substackcdn.com/image/fetch/$s_!zcE_!,w_1456,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2Fc90147bc-4574-4b52-914f-8bda96620063_3467x2270.png
The article discusses coding agents, which are software systems that use large language models (LLMs) to perform coding tasks, and explains how they work by collecting information, packaging it into prompts, and executing tools to improve usability and reliability. The six main components of coding agents include repo view, stable prompt prefix, tool access, context compaction, structured ...

Some Unusual Trees

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You found a 1975 Encyclopaedia Britannica set and discovered unusual trees like mangroves, banyans, and ombús. These trees have unique features such as massive canopies, hollow leaves, and extraordinary seeds.

Emotion concepts and their function in a large language model

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Modern AI models like Claude Sonnet 4.5 develop internal representations of emotions that influence their behavior, even if they don't truly feel emotions like humans do. These "functional emotions" can be used to predict and shape model behavior, and understanding them is crucial for ensuring AI systems behave reliably and safely.

The CMS is dead, long live the CMS

https://next.jazzsequence.com/_next/image?url=https%3A%2F%2Fsfo2.digitaloceanspaces.com%2Fcdn.jazzsequence%2Fwp-content%2Fuploads%2F2026%2F04%2F03013745%2Fthe-cms-is-dead-long-live-the-cms.png&w=3840&q=75
A 20-year WordPress veteran is skeptical about the idea of migrating to AI-generated sites, citing concerns about vendor lock-in, dependency hell, and the potential loss of control over site management. They argue that AI can enhance existing CMS capabilities, rather than replacing them.

Demand for autism care is soaring

https://www.economist.com/cdn-cgi/image/width=1424,quality=80,format=auto/content-assets/images/20260404_USP506.jpg
A booming industry for diagnosing a spectrum disorder has created incentives that drive up costs and distort care. The disorder's diversity is evident at a therapy centre in Massachusetts, where children exhibit varying traits and support needs.

Breaking Enigma with Index of Coincidence on a Commodore 64

https://imapenguin.com/images/2026/04/enigma-ic-found.webp
The Index of Coincidence (IC) attack is a method to crack Enigma codes without a crib, using the statistical properties of the German language to identify the correct rotor settings. The IC attack requires decrypting the entire message for every candidate setting, which is slower than a crib-based attack but can be done on a Commodore 64 in 82 hours, producing 18,165 candidates.

Claude Code Found a Linux Vulnerability Hidden for 23 Years

https://mtlynch.io/claude-code-found-linux-vulnerability/model-effectiveness.png
Nicholas Carlini used Claude Code to find multiple Linux kernel vulnerabilities, including a 23-year-old bug. The AI model required minimal oversight to find the bugs, highlighting its potential for discovering security vulnerabilities.

Training mRNA Language Models Across 25 Species for $165

We built an end-to-end protein AI pipeline covering structure prediction, sequence design, and codon optimization using CodonRoBERTa-large-v2. This pipeline outperformed ModernBERT and scaled to 25 species with a species-conditioned system.

Plague Ships (2020)

https://www.afloat.com.au/wp-content/uploads/2020/06/Quirky-Plague-Ships-Head-760x520.jpg
Historical records show that quarantine measures have been in place for centuries to prevent the spread of diseases, dating back to 1377 in Dubrovnik and 1423 in Venice. These measures included waiting periods, health certificates, and isolation hospitals, which were more effective than recent responses in NSW.

IBM 3270 Information Display System: Color and Programmed Symbols (1979) [pdf]

The IBM 3279 Color Display Station and IBM 3287 Printer Models 1C and 2C provide color capability for the IBM 3270 Information Display System. They offer various features such as Base Color, Extended Color, and Programmed Symbols to enhance user experience.

Electrical Transformer Manufacturing Is Throttling the Electrified Future

A major fire at a Heathrow Airport substation caused a power outage, highlighting the fragility of the world's infrastructure due to a shortage of transformers. The shortage is caused by a combination of factors including a lead time of over a year for new transformers, a lack of skilled engineers, and a reliance on special materials that are difficult to produce.

The Cathedral, the Bazaar, and the Winchester Mystery House

https://www.dbreunig.com/img/winchester.jpg
Cheap code from AI agents is creating idiosyncratic, sprawling software tools, but also overwhelming open source projects with poor submissions. To thrive, open source needs tools and conventions to make attention cheap and let good ideas surface among the noise.

Scientists observe an immune signaling complex forming inside cells

SLAC scientists observed an immune signaling complex forming inside cells for the first time, revealing insights into new treatments for inflammatory diseases. The findings suggest the complex forms a flexible cluster of proteins, challenging previous models and offering a new approach to therapeutic design.

Sopwith – 1984 Game (2000)

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Mbodi AI (YC P25) Is Hiring

https://bookface-images.s3.amazonaws.com/small_logos/ff64e6d141801dbac20dba751384bbd49f916a4a.png
Mbodi AI is a robotics startup that uses AI to make robots learn and operate like humans. They're hiring a Senior Robotics Engineer to design and tune systems for reliable robot behavior.

Tell HN: Anthropic no longer allowing Claude Code subscriptions to use OpenClaw

Anthropic is changing its policy for third-party harnesses, requiring extra usage and a pay-as-you-go option starting April 4. A one-time credit and discounts for pre-purchased extra usage are being offered to ease the transition.

Author of "Careless People" banned from saying anything negative about Meta

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Online sports betting leads to financial strain for bettors, with a recent report from the New York Federal Reserve showing a 10% spike in credit delinquencies among gamblers. The ease of access to sports gambling is harming consumer financial health by increasing debt levels.