Watching o3 guess a photo's location is surreal, dystopian and entertaining

https://static.simonwillison.net/static/2025/guess-location.jpg
The user tested OpenAI's o3 model by guessing the location of a photo taken in El Granada, California. The model correctly identified the Central Coast of California but incorrectly pinpointed the location as Cambria, 200 miles off.

Bare metal printf – C standard library without OS

https://popovicu.com/Bare%20metal%20printf%20-%20C%20standard%20library%20without%20OS.png
We used Newlib to create a compact C standard library for a bare metal system on RISC-V, implementing UART primitives and passing them to Newlib to build a full printf functionality. We set up a cross-compiler toolchain, configured it to use Newlib, and built a minimal C runtime to run on the bare metal system, allowing us to use printf and other C standard library functions.

Sigbovik Conference Proceedings 2025 [pdf]

A team of squirrels evaluates each paper for authorship not shown. nse ensures that only individuals exceeding an intelligence quotient can perceive encoded information. the system dynamically suppresses semantic and visual recogni- tion pathways in real time. to share the gist with the cognitively less-gied, we decided to leave this abstract, and section headers, untouched by our technology. ...

Open-source interactive C tutorial in the browser

https://www.learn-c.org/static/img/share-logos/learn-c.org.png
Whether you are an experienced programmer or not, this website is intended for everyone who wishes to learn the C programming language. There is no need to download anything - Just click on the chapter you wish to begin from, and follow the instructions. Good luck! learn-c.org is still under construction - If you wish to contribute tutorials, please click on Contributing Tutorials down below.

Show HN: My self-written hobby OS is finally running on my vintage IBM ThinkPad

https://raw.githubusercontent.com/joexbayer/RetrOS-32/main/graphics/logo.png
The project is a 32-bit operating system for i386 architecture with networking capabilities, built with C, Assembly, and C++. It supports cross-platform compilation using Docker and QEMU.

Path is a utility for working with paths

https://gitlab.com/assets/twitter_card-570ddb06edf56a2312253c5872489847a0f385112ddbcd71ccfa1570febab5d2.jpg
GitLab.com

Bill Gates's Personal Easter Eggs in 8 Bit BASIC (2008)

https://www.weihenstephan.org/~michaste/pagetable/wait6502/altair.jpg
Microsoft added an Easter egg to their BASIC interpreter for the Commodore PET, which printed "MICROSOFT!" when typing "WAIT6502,1".

Found a simple tool for database modeling: dbdiagram.io

https://dbdiagram.io/static/img/holistics-logo-square.b61aa68.png
Holistics.io offers DBDiagram for database schema visualization with a Personal Pro plan at $14/month for extra power and unlimited diagrams. DBDiagram uses DBML, an open-source markup language for documenting database structures, born out of dbdiagram.

Amazon Just Happens to Hold Book Sale During Independent Bookstore Day

https://gizmodo.com/app/uploads/2025/04/GettyImages-1229076456.jpg
Amazon's book sale coincides with Independent Bookstore Day, prompting criticism from indie booksellers who view it as an attempt to undermine their success. Local bookstores have adapted to the online ecosystem and formed strong bonds with their communities, making Amazon's sale seem like petty posturing.

An end to all this prostate trouble?

https://yarchive.net/photos/vein_diagram1.webp
Spermatic vein backflow is not the new part of their theory. ideal would be valve repair or replacement, but not on vein valves, says dr. sanjay gupta, author of the paper cited above. the ideal is to replace the valve with a catheter, he says, and it won't last forever if it fails - as some have suggested 'in the womb' venous

Dad and the Egg Controller (2018)

https://i.imgur.com/1MhR3n9.jpg
The narrator's dad was an inventor who built a device called the Egg Controller to control the temperature of a Big Green Egg barbecue. The narrator struggled to understand the device's interface but eventually figured it out and successfully used it to cook a pork shoulder for a memorial lunch.

IcôNES

Anatomy of a SQL Engine

https://www.dolthub.com/blog/static/max-bitmoji-ba2b0b2670048884cd11b7f5ea88bf7b.png
Dolt's SQL engine performs steps from parsing to result spooling, including binding, simplification, and join planning. The engine uses intermediate representations to optimize query execution, including join costing and execution with tiered storage and result spooling.

BART's Anime Mascots

https://www.bart.gov/sites/default/files/styles/max_width/public/images/basic_page/anime%20mascots.png?itok=vxNpa3mz
BART introduced anime mascots Mira, Jasmine, Baylee, and Nimbus to promote public transportation use among youth riders. The mascots were created by California-based artists following a 2022 open call and are available as merchandise on railgoods.com.

The Passing of Ucbvax (1994)

The ucbvax computer at UC Berkeley was retired after 16 years of service, with a ceremony held to honor its history and contributions. It will be repurposed as a card-key access system controller for the UC Police department.

Slinky-Coil Dipole (2021)

https://nonstopsystems.com/radio/img-ant/slinkystamp3.jpg
A Slinky coil can be used as a compact, lightweight antenna for various frequencies. It can be stretched to different lengths and used as a dipole or helical antenna.

Parity (YC S24) is hiring founding engineers to build an AI SRE (in-person, SF)

https://bookface-images.s3.us-west-2.amazonaws.com/logos/44a87c3d5067d4f5632f07747c60c172286c4947.png?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=ASIAQC4NIECADEOUH5SA%2F20250410%2Fus-west-2%2Fs3%2Faws4_request&X-Amz-Date=20250410T222939Z&X-Amz-Expires=3600&X-Amz-Security-Token=IQoJb3JpZ2luX2VjEDYaCXVzLXdlc3QtMiJHMEUCIQDKFMoWXOj0ZQlWLWNHrPk2vXRCFLxtThMK4%2B3h8aGSEAIgax4iHnmCh884Hn6PGoLS5eCBCpYtyYYX6fkigGZhpWoq7gMIr%2F%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FARAAGgwwMDYyMDE4MTEwNzIiDNByQOS0C7jfEF76ISrCA19a5xSmqFfIirtX5w18FCXcfGmLKhjOVEkc0%2Fq%2FjF%2BB92YGPcGZl8wAJZfz7qx1XcfWKjFgTMvo2aZTzDXI3KxetHn0KH4HR2MNE4ZoA1gmhgUXui10aGyzQE%2Br0p%2FaPKsW1AEVqk%2FwlLqlcaujWcdl1WeM%2FK60NBS6jUeWWC6WH2n2%2B1VcTF0DbHZwHYJ8fn7CVZ7eJxBK2AOhqX1dz%2BwY7sGhr%2Bffos1uQRqgvDd0Q224Yc93GfGGzGXMazwAwy1%2FVlxEk4YRQq%2BccIN4hASkVlN%2B2v4vPu006nyFGlVSSaSXeFYETcO%2Bt2Kbll5u9uDRDNVXJtGG97sQLs%2B%2F%2Fe%2B7el8Wbw5NSwQqmHQ2eiKk6e29BPtZjVCPhlrRIp8U5eNwq2F%2F4itkgXxku632zh17cdO4GSpppIoYcLHcKHoNBdKaZltBUH4cgZwczsNi8PRNZWC8fFkj%2BpQrQQbXVOVt7n8rDlsW705kJW%2BfGuuGHPjjGS7g5QrHv266%2FY%2FL0tAfDZKIyNCJ1%2FJ0WvIA86Paut9uUIrJMgnjPNELE%2BoJ6D%2F5JeSIiBWGm9wE%2F7ZxLvQp%2FMW5wrvfbWgb40CqKyBAGzDChuG%2FBjqlAUrE88OEJrhaX4ZQOrTis4rqEi2nirjwuPXANDjYz5HZK%2BWx275hOJj7suAGwtzp%2B6jyw08QfJkAgjdoewkRQnvV96rKWfNhCS5Ia6Ih61E0pGqKdn1DneGbwHMaIe%2BXkFGZjCYI4OWM6Ri1NBsAT%2BzVBTsi8QeOH3zE0QTQtWlnA6qzYNyXmugHPHtWhLbtORKChEKWpabnEJweK8Ougoxj4adGYA%3D%3D&X-Amz-SignedHeaders=host&X-Amz-Signature=f26455f465f5da00316175aade3b60314415c7571fd6213a44ab7491e0e214d2
Parity is using AI to automate on-call tasks, reducing the burden on teams. Backed by top investors, Parity is building a product to define a new category in infrastructure management.

Cloth

A 2D cloth Verlet simulation made in Rust

The Friendship Recession: The lost art of connecting

https://images.squarespace-cdn.com/content/v1/6554db6c62a0492c6c1995bc/cc456037-667d-4188-9047-9fcb9b67d612/CPL_Leadership_Happiness_Lab_Lockup_reverse+%28002%29.png?format=1500w
The "Friendship Recession" is a cultural shift where Americans are prioritizing work and family over friendships, leading to a decline in meaningful relationships. To combat this, individuals must take initiative to form and sustain connections through shared experiences and rituals, rather than relying on digital interactions.

CosAE: Learnable Fourier Series for Image Restoration

https://sifeiliu.net/CosAE-page/static/images/anyres.png
CosAE is a novel autoencoder that uses Fourier series with a neural network to encode images with extreme spatial compression without losing detail. It surpasses state-of-the-art approaches in super-resolution and blind image restoration tasks.

Tilt: dev environment as code

https://raw.githubusercontent.com/tilt-dev/tilt/master/assets/tilt-video.png
Tilt automates microservice development by watching files, building container images, and updating the environment. It supports various languages and has community resources for configuration and contribution.

HTTP Feeds: a minimal specification for polling events over HTTP

HTTP feeds allow asynchronous decoupling of systems without message brokers, using a client that fetches events with a lastEventId query parameter. The server supports long polling for lower latency and uses a time-ordered UUIDv6 or database sequence as event ID for strong ordering.

Stuffed-Na(a)N: stuff your NaNs

https://raw.githubusercontent.com/si14/stuffed-naan-js/main/naan.jpg
stuffed-naan encodes data as NaNs, preserving it in math operations and compressing data by 25%. It's fast, privacy-first, and can't be copied without losing data.

Mobygratis – Free Moby music to empower your creative projects

https://mobygratis.com/assets/moby-header-image3.jpg
Mobygratis provides free instrumental music for all creators. It offers three free format options: stereo MP3, stereo WAV, and multitrack WAV.

Australian who ordered radioactive materials walks away from court

https://d2cbg94ubxgsnp.cloudfront.net/Pictures/159x106/2/6/7/540267_gettyimages1206042201_171493.jpg
A 24-year-old Australian man received a two-year good behavior bond for ordering and possessing radioactive materials without permits. The judge considered his mental health issues and lack of malicious intent, despite a major hazmat incident in August 2023.

Brett Terpstra Is Open to Work

https://cdn3.brettterpstra.com/images/hcardheadshot@2x.jpg
After 4 years with Oracle, I find myself free for new work. I met a lot of good people there, but am excited about the possibility of a new path. I’m scared in the short term, but optimistic for the long term. I could really use your support right now. Here are the ways to support me: Let me know if you have any job leads (see below for more about what I’m looking for) I’ll have some extra ...

Robot Dexterity Still Seems Hard

https://substackcdn.com/image/fetch/w_520,h_272,c_fill,f_auto,q_auto:good,fl_progressive:steep,g_auto/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2Fae4672e0-1639-4c1b-88bf-8a963d1d8e4b_1180x952.png
Humanoid robots are being developed by numerous companies, with some raising hundreds of millions of dollars in funding, but they still struggle with dexterity and manipulation.

TPSV, an Alternative to TSV (and CSV)

TSVP has advantages over CSV and TSV due to its simpler parsing and alignment capabilities. It uses a pipe character to separate cells and allows for row continuations and comments.

LLMs can see and hear without any training

https://raw.githubusercontent.com/facebookresearch/MILS/main/teaser.png
The code downloads and uses several datasets including MS-COCO and Clotho for image captioning, and evaluates the performance of the MILS method on these datasets. The code also uses audio and video captioning to convert audio and video to text, and then combines the captions to generate high-quality images using a language model.

Solar Orbiter's widest high-res view of the Sun

https://www.esa.int/var/esa/storage/images/esa_multimedia/images/2025/04/making_a_mosaic_of_the_sun/26672596-1-eng-GB/Making_a_mosaic_of_the_Sun_card_medium.gif
Solar Orbiter captured a detailed view of the Sun's million-degree hot atmosphere, combining 200 individual images in ultraviolet light. The image shows glowing coronal loops, dark filaments, and prominences in the Sun's messy magnetic field.