Someone turned PostgreSQL's internals into an explorable 3D city you can wander through.
What the article says
- The site renders a 3D city where each part of Postgres, like the scheduler, transactions and query planner, becomes a building or machine.
- A guided tour walks you through how the database handles a query step by step.
- You can click around the city, pause the simulation, and slow it down to watch things like transaction speed up close.
- It doesn't yet take a real query and trace it through the system, the tour is fixed rather than interactive.
- Note: the page is a heavy 3D app with no extractable text, so this is inferred from the title, description and comments.
What HN is saying
- People loved the idea but found it overwhelming, with popups and info boxes covering most of the 3D scene at once.
- Several asked for a way to slow things down, then found out pause and speed controls already exist, just tucked in a corner.
- A commit credit revealed the project was largely built with Claude, which split opinion between admiration and unease about vibe coded tools.
- Some want it to go further and become a live query tracer, so you could type SQL and watch it move through the city.
- One person joked that someone should make a noir film called Postgres, set in a city where every secret has an index.
A Harvard astrophysicist built a black hole you can drop into your actual room with your phone.
What the article says
- A black hole researcher at Harvard built a browser app that renders one using real relativistic physics rather than a fake movie effect.
- You can view it on screen, place it in your room with augmented reality, or step into it with a VR headset.
- It shows light bending around the hole and brightness shifting with your viewing angle, both real effects near black holes.
- Point your camera at it and it warps your actual surroundings, bending light from behind you into view in front.
- Nothing is uploaded, there is no signup, and the source code is public.
What HN is saying
- One commenter, who works on black hole imaging professionally, pushed back hard, arguing the simulation is not actually physically accurate. He said the disk color, the doppler math, and the brightness mapping all cut corners for visual appeal.
- The creator conceded several points, calling it a simplified visualization rather than research grade science, and defended the color choice as an arbitrary but harmless stylistic pick.
- A few people admitted the effect gave them real vertigo or fear, comparing it to a childhood phobia triggered by an old VR space demo.
- Someone flagged a similar iOS app from Vanderbilt that bends light too but skips the time delay effect this one includes.
A HyperCard revival that lets you build little apps, games, and zines with real scripting, no ads or tracking.
What the article says
- Decker is a modern take on HyperCard, the old Mac tool for building small interactive programs by clicking and drawing rather than heavy coding.
- It keeps the retro black and white pixel look but adds things like undo history, touchscreen support, and easier bulk editing.
- You can make presentations, notes apps, adventure games, or pixel art, then export a finished project as a single web page anyone can open.
- It includes its own simple scripting language for people who want to go beyond drag and drop.
- It runs on Mac, Windows, Linux, and BSD, and has no ads, tracking, or AI features baked in.
What HN is saying
- Longtime HyperCard users say its magic is hard to explain to anyone who never touched it, comparing it to the feeling of an old game world that seems more alive than a modern one.
- Several people ask what replaced tools like HyperCard and FileMaker for small custom apps today, with answers ranging from Airtable to just building things with an AI model now.
- The creator pushes back on the idea that this is just nostalgia, pointing to hundreds of real games and zines made with Decker and one that just shipped on Steam.
- A few commenters want a modern color theme option, saying the black and white look feels like extra effort for people used to today's interfaces.
- One thread digs into how the tool handles fonts and data, showing it can do more than the simple retro look suggests.
Vercel built a tool that turns TypeScript straight into a native app, no JavaScript engine required.
What the article says
- Vercel released scriptc, which compiles ordinary TypeScript into a small, fast native program instead of running it through Node or a browser engine.
- You write the same TypeScript you already use. The tool figures out which parts can become pure native code and which parts still need help.
- For code it cannot handle statically, it can optionally pack in a tiny JavaScript engine, so things still run even if not everything compiles cleanly.
- It supports most of the Node toolkit people actually use, like file access, networking, and web requests, along with common language features like classes and async code.
- Anything it truly cannot handle just fails with a clear error, rather than silently producing broken output.
What HN is saying
- Commenters were struck by how much ground this covered so quickly, and the top reply pins it on AI coding agents, noting contributors added nearly a million lines of code in a single week.
- One frequent critique is a practical one. Real projects lean on npm packages that ship plain untyped JavaScript, so you would still need a JavaScript engine unless you avoid the ecosystem entirely.
- A few readers said the project's writing style has telltale signs of being AI generated, and someone confirmed pull requests are actively cleaning that up.
- There is a broader current of skepticism about Vercel itself, with some predicting this gets hyped online and then abandoned, and others saying it has cost the company credibility.
- Still, a handful of people simply said they like the idea, even amid the doubts.
French firefighters just met a fire so fierce it made its own weather, and they had to retreat.
What the article says
- A wildfire in southwest France got so hot it created a pyrocumulonimbus, a storm cloud made of smoke that generates its own wind and lightning.
- This kind of fire cloud is common in Australia and North America but has never happened in France before.
- A fire chief explains the blaze now creates its own winds that shift constantly, so crews cannot predict where it will spread next.
- Firefighters say they have hit a point where direct attack is impossible and are focused on defending people and key sites instead.
- Real relief would take days of heavy rain, or steering the fire toward the sea where it burns itself out.
What HN is saying
- Commenters note the burning forest is not wild but a man made pine monoculture planted in the 1800s, which burns unusually fast and easily.
- A side debate breaks out over whether pyrocumulonimbus is even the right word, since the cloud rarely produces real rain.
- Several people in Bordeaux describe the scene firsthand, with mass evacuations, smoke blotting out the sky, and the airport still open but surrounded by evacuated land.
- The thread pivots to climate change, with some saying it is the obvious driver and others pointing out this pine region has burned badly before, including a major fire in 1949.
- A tangent on carbon offset credits asks what happens to them when the trees planted to earn them burn down, and commenters agree the credits usually stay valid regardless.