The signal in the feed.

A space history mystery: What happened to the Viking arm used 50 years ago?

A timely tale about a 50-year-old robotic arm...

useState vs useReducer vs Zustand: I Built the Same Feature Three Ways (With Live Render Counts)

"Should I use useState, useReducer, or a store like Zustand?" usually gets answered with vibes. So I built all three running the same feature, side by side, with live render counts — because the thing that actually drives the decision is invisible until you watch it. ▶ Live demo: https://state-mgmt-compare.vercel.app/ Source (React 19 + real Zustand): https://github.com/dev48v/state-mgmt-compare Two views read two slices — count and name. Click "bump count" in each column and watch the per-view

What is React Fiber? How React Works Under the Hood

Estimated read: ~18 minutes. I'll assume you're comfortable with React basics — components, state, the "virtual" DOM, and the idea of "reconciliation" — and ready to peek under the hood. We'll build everything else up together. Most of us learn React as a friendly black box: you change some state, the UI updates, everyone goes home. That model holds up fine until the day your app feels sluggish, or an interview asks: What actually happens between setCount(1) and the screen changing? And you real

Ask HN: Who is hiring? (July 2026)

Please state the location and include REMOTE for remote work, REMOTE (US) or similar if the country is restricted, and ONSITE when remote work is not an option. Please only post if you personally are part of the hiring company—no recruiting firms or job boards. One post per company. If it isn't a household name, explain what your company does. Please only post if you are actively filling a position and are committed to replying to applicants. Commenters: please don't reply to job posts to compla

Ask HN: Who wants to be hired? (July 2026)

Share your information if you are looking for work. Please use this format: Location: Remote: Willing to relocate: Technologies: Résumé/CV: Email: Readers: please only email these addresses to discuss work opportunities. Searchers: try https://nthesis.ai/public/hn-wants-to-be-hired, https://www.wantstobehired.com. Comments URL: https://news.ycombinator.com/item?id=48747975 Points: 106 # Comments: 243

I built a VS Code Extension that mocks your OpenAPI spec locally — no Postman, no Docker, no Context switching

Every time I had to test an API endpoint while writing an OpenAPI spec, I had to leave VS Code, open...

Rotman Lens

The GNU Emacs Architecture: Unlocking the Core [pdf]

LLMs are stuck in a groupthink groove. This startup is trying to get them out.

Let’s start with a game. Open up your chatbot of choice—Claude, ChatGPT, Gemini—and type “Give me a random number between 1 and 10.” You’re going to get 7. Almost always. Now type “Another” and you’ll get 3 or 4. Type “Another” again and you’ll get 8 or 9. That won’t work every time—but if it…

The Deploy Shipped. The Route Got Worse. Now What?

A route regression after deploy is not an alert by itself. It is a question the team has to answer before the release fades into memory. The app stayed up. The deploy was green. Error volume did not explode. But a route that matters started behaving differently. Signup completion softened. Checkout abandonment rose. Invite acceptance dipped. Onboarding step two suddenly had more exits than usual. That is the gray zone where most teams lose time, because every tool has a piece of the story and no

Sony Deletes 551 Movies PlayStation Owners Paid For

Venice AI becomes a unicorn with $65M Series A as its privacy-first AI platform takes off

Venice AI is already profitable, with annualized run-rate revenues of over $70 million, CEO Erik Voorhees said.