Amateur armed with ChatGPT solves an Erdős problem

https://static.scientificamerican.com/dam/asset/124ad289-58c2-4d51-87e8-aee854d10fc7/abstract-rubiks-cube.jpg?m=1777033076.511&w=600
A 23-year-old man named Liam Price used ChatGPT Pro to solve a 60-year-old math problem left by Paul Erdos. The AI's solution, which was posted online, appears to be original and may have broader applications in mathematics.

Why has there been so little progress on Alzheimer's disease?

Tell HN: An app is silently installing itself on my iPhone every day

Headspace app is silently appearing on iPhone 13 Pro around 1pm EST daily. Reports of similar issue on Reddit suggest it may be a widespread iOS issue.

USB Cheat Sheet (2022)

https://fabiensanglard.net/usbcheat/typeb3.svg
A USB cheat sheet was created to clarify USB terms and save time. It covers USB versions, lane striping and bonding, and wire configurations for different USB speeds.

GnuPG – post-quantum crypto landing in mainline

A new version of GnuPG, 2.5.19, is available with several new features and bug fixes. It is recommended to update to this version before the old 2.4 series reaches end-of-life in two months.

The route from Prussian military headquarters to Gary Gygax’s basement

https://asteriskmag.com/media/pages/issues/14/shall-we-play-a-game/b4f85ae95a-1776212473/jon_kriegsspiel-300x.jpg
Jon Peterson discusses the history of wargames and their evolution into tabletop role-playing games, highlighting key figures and innovations such as Georg Venturini and the Reisswitzes' Kriegsspiel. The conversation also touches on the influence of wargaming on modern tabletop games, including Dungeons & Dragons, and the ongoing debate about the role of rules and agency in game design.

Mahjong: A Visual Guide

https://themahjong.guide/cover_page.png
A mahjong set has 136 tiles with 34 unique designs, four of each, and honor tiles. A winning hand is 4 sets + 1 pair, totaling 14 tiles, with the pair called the "eyes".

EU Age Control: The trojan horse for digital IDs

https://juraj.bednar.io/wp-content/uploads/2026/04/cover-eu-age-1200x670.jpeg
The EU Age Verification app is a reference implementation with several problems, including a fallback to normal KYC providers, attestation lock-in to Google or Apple devices, and weaker cryptography than advertised. The app's design relies on wallet behavior for unlinkability, not cryptographic guarantees.

Flickr: The first and last great photo platform

https://petapixel.com/assets/uploads/2026/04/Flickr-The-First-and-Last-Great-Photo-Platform-800x420.jpg
Flickr remains a unique online community for photography enthusiasts, offering robust features and a sanctuary from algorithm-driven content. Its Pro subscription provides benefits like unlimited storage, ad-free galleries, and exclusive savings, justifying the cost for many users.

OpenAI Privacy Filter

https://images.ctfassets.net/kftzwdyauwt9/cut4wyUCuBENXfd5CSI7Z/d934ffb49d8b39abea0bc33bb1a5b916/Hero_Art_Card_SEO_1x1.jpg?w=3840&q=90&fm=webp
OpenAI releases Privacy Filter, a small model for detecting and redacting PII in text, designed for high-throughput privacy workflows and context-aware detection. It achieves state-of-the-art performance on the PII-Masking-300k benchmark and can be fine-tuned for different data distributions and privacy policies.

The Free Universal Construction Kit

https://fffff.at/files/2012/03/kit_6463_collection_500x333.jpg
The Free Universal Construction Kit is a set of adapters that allows children's construction toys to work together, promoting creative play and hybrid designs. The Kit is a grassroots remedy for proprietary toy systems, available for free download and 3D printing.

1-Bit Hokusai's "The Great Wave" (2023)

https://i0.wp.com/www.hypertalking.com/wp-content/uploads/2023/05/Fuji-01.png?resize=512%2C342&ssl=1
User is recreating Hokusai's 36 views of Mount Fuji as 1-bit pixel art on old Macintosh computers for nostalgia and flow state. They use Aldus SuperPaint 3.0 on Quadra 700 or PowerBook 100 to create authentic 512x342 pixel images.

AGPLv3§74 Empowers Users to Thwart Badgeware Like OnlyOffice

https://sfconservancy.org/static/img/conservancy-logo.png
A company, Ascensio System SIA, added a restriction to their software, Onlyoffice, licensed under AGPLv3, requiring users to display their trademarked logo. This restriction is considered a "further restriction" that users can remove under AGPLv3§7¶4.

Reviving BrowserID in 2026

You're building WKID, a BrowserID-style identity provider for your personal projects. WKID is a lightweight, federated, and private IdP that uses email domains for authentication, allowing you to control your own authentication flows.

Using coding assistance tools to revive projects you never were going to finish

https://blog.matthewbrunelle.com/content/images/size/w1920/2026/04/feishin_play_sub_standard.png
The user tested Claude Code with a personal project, a shim between YouTube Music and OpenSubsonic API, and found it helpful in implementing the project from scratch. The user was able to get a working service in a short evening, but still has concerns about relying too much on AI coding assist and losing skills.

The Joy of Folding Bikes

https://blog.korny.info/assets/images/2026-04-19-the-joy-of-folding-bikes/brompton_feb_2015.png
I recently started using a folding bike, a Brompton, which has greatly improved my commuting experience. It's convenient, durable, and cost-effective, paying for itself in just 28 weeks.

Rediscovering the Handcart

https://solar.lowtechmagazine.com/2026/04/rediscovering-the-handcart/images/dithers/IMG_2725_dithered.png
The human-powered handcart is the oldest of vehicles, and it will likely be the last one around in the future. Of all vehicles, it’s the cheapest and least complex to build and use. It offers a large advantage over carrying a load on your back or dragging it over the ground - the even older concept of the sled. On the other hand, the handcart is cheaper and easier to use than the ...

Per-image PCA characterization of the Kodak image suite (PDF and JSON)

https://opengraph.githubassets.com/799bca105fb1ea8a4a020565275167e80ee5cd5242d98c99cf24a5b7471dd373/PearsonZero/kodak-pcd0992-statistical-characterization
Per-image principal component decomposition of the Kodak Lossless True Color Image Suite (PCD0992). First published statistical characterization of inter-channel redundancy structure across all 24 images. - kodak-pcd0992-statistical-characterization/baseline at main · PearsonZero/kodak-pcd0992-statistical-characterization

America's Geothermal Breakthrough

https://d32r1sh890xpii.cloudfront.net/article/1200x675/2026-04-23_qw906tcvvx.jpg
The US geothermal energy sector is expanding with support from the government and innovations in enhanced geothermal technologies. Companies like Fervo Energy are leading the way with new projects and technologies to access geothermal resources.

DeepSeek-V4 on Day 0: From Fast Inference to Verified RL with SGLang and Miles

https://www.lmsys.org/images/blog/deepseek_v4/benchmark_vs_oss.png
DeepSeek-V4 is supported on both inference and RL training with SGLang and Miles forming the first open-source stack to serve and train it on launch day. The system combines hybrid sparse-attention architecture, manifold-constrained hyper-connections, and FP4 expert weights with various optimizations and kernel-level improvements to achieve high throughput and efficiency.

New 10 GbE USB adapters are cooler, smaller, cheaper

https://www.jeffgeerling.com/blog/2026/new-10-gbe-usb-adapters-cooler-smaller-cheaper/thunderbolt-and-usb-c-10g-ethernet-adapters.jpg
A new 10G USB 3.2 adapter from WisdPi offers a compact alternative to bulky Thunderbolt adapters, but its performance depends on the USB port's bandwidth. It reaches full 10 Gbps speed only with a USB 3.2 Gen 2 2x2 port, otherwise it's slower.

Martin Galway's music source files from 1980's Commodore 64 games

https://opengraph.githubassets.com/955831c990aba9412657c54087d9effa3f964c654b63f4339c1cfc9a97c73c00/MartinGalway/C64_music
The user is sharing music player information from the 1980s, specifically from games like Wizball and Athena, and is allowing others to use and modify the work. The user acquired the rights to the music and code from Infogrames and credits the original author, Martin Galway.

Math Is Hard – OpenBSD Stories

http://miod.online.fr/software/openbsd/stories/itsatrap.jpg
The VAX architecture had a simple exception model with traps and faults, but the kernel had to skip the instruction in case of a fault to prevent a signal loop, which was not possible due to the hardware design. A fix was implemented in 2002 to add a skip_opcode function to compute the address of the next opcode, effectively skipping the offending instruction, and it was later carried over to OpenBSD.

The Super Nintendo Cartridges (2024)

https://fabiensanglard.net/10nes/cic_duo_nofont.svg
The Super Nintendo had various enhancement chips, including the SA-1, CX4, and GSU-1, which improved performance and added features to games. These chips were used in a total of 72 games.

Optimizing Datalog for the GPU

Hokusai and Tesselations

https://dl.ndl.go.jp/contents/14036633/thumb.jpg
アイテム詳細画面 - 国立国会図書館デジタルコレクション マイコレクションに追加したコマはありません 画像調整(「画像の傾き・範囲」「色調」)は印刷する 全てのコマ に反映されます。 国立国会図書館デジタルコレクションでのクッキーの使用 当ウェブサイト(https://dl.ndl.go.jp/ 及び https://rekion.dl.ndl.go.jp/)は、図書館サービスとしてウェブサイトを機能させるために必要なクッキー(Cookie)を使用しています。また、当ウェブサイトの利用状況を計測し、改善に役立てるためのアクセス解析クッキーを設定することもありますが、このクッキーは、利用者が同意した場合にのみ設定されます。同意はいつでも取り消すことができます。

Show HN: Browse GitHub repos in Emacs without cloning

https://raw.githubusercontent.com/agzam/remoto.el/main/test/el-remoto-logo.png
remoto.el registers a virtual filesystem via file-name-handler-alist that translates standard Emacs file operations into GitHub API calls via the gh CLI. The result: find-file, dired, tab-completion, dired-subtree - all standard Emacs file tooling works against a remote GitHub repo. Read-only. Sometimes you just want to look at code. Check a function signature, read a README, browse a project ...

Simulacrum of Knowledge Work

https://blog.happyfellow.dev/static/og-image.png
Report quality is often judged by superficial measures like writing style, not actual content. This can lead to reliance on AI-generated work, where appearance of quality is prioritized over actual value.

The Long Reply

https://storage.ghost.io/c/99/08/9908ec0b-b3d5-476b-bc3c-632c5b087809/content/images/size/w2000/2026/04/header-1.jpg
The author shared a post about a man named Noah who posts photos of the same tree every year, and it went viral. The author also shared their own experiences with long-term replies, including one from 25 years ago.

The George Business, by Roger Zelazny (1980)

George hired a dragon named Dart to abduct a woman named Rosalind, so he could win her hand in marriage. However, the plan failed when Rosalind married another suitor instead.