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Start all of your commands with a comma

https://rhodesmill.org/brandon/2009/commands-with-comma/
143•theblazehen•2d ago•42 comments

OpenCiv3: Open-source, cross-platform reimagining of Civilization III

https://openciv3.org/
668•klaussilveira•14h ago•202 comments

The Waymo World Model

https://waymo.com/blog/2026/02/the-waymo-world-model-a-new-frontier-for-autonomous-driving-simula...
949•xnx•19h ago•551 comments

How we made geo joins 400× faster with H3 indexes

https://floedb.ai/blog/how-we-made-geo-joins-400-faster-with-h3-indexes
122•matheusalmeida•2d ago•33 comments

Unseen Footage of Atari Battlezone Arcade Cabinet Production

https://arcadeblogger.com/2026/02/02/unseen-footage-of-atari-battlezone-cabinet-production/
53•videotopia•4d ago•2 comments

Jeffrey Snover: "Welcome to the Room"

https://www.jsnover.com/blog/2026/02/01/welcome-to-the-room/
17•kaonwarb•3d ago•19 comments

Show HN: Look Ma, No Linux: Shell, App Installer, Vi, Cc on ESP32-S3 / BreezyBox

https://github.com/valdanylchuk/breezydemo
229•isitcontent•14h ago•25 comments

Vocal Guide – belt sing without killing yourself

https://jesperordrup.github.io/vocal-guide/
28•jesperordrup•4h ago•16 comments

Monty: A minimal, secure Python interpreter written in Rust for use by AI

https://github.com/pydantic/monty
223•dmpetrov•14h ago•117 comments

Show HN: I spent 4 years building a UI design tool with only the features I use

https://vecti.com
330•vecti•16h ago•143 comments

Hackers (1995) Animated Experience

https://hackers-1995.vercel.app/
494•todsacerdoti•22h ago•243 comments

Sheldon Brown's Bicycle Technical Info

https://www.sheldonbrown.com/
381•ostacke•20h ago•95 comments

Microsoft open-sources LiteBox, a security-focused library OS

https://github.com/microsoft/litebox
359•aktau•20h ago•181 comments

Show HN: If you lose your memory, how to regain access to your computer?

https://eljojo.github.io/rememory/
288•eljojo•17h ago•169 comments

An Update on Heroku

https://www.heroku.com/blog/an-update-on-heroku/
412•lstoll•20h ago•278 comments

PC Floppy Copy Protection: Vault Prolok

https://martypc.blogspot.com/2024/09/pc-floppy-copy-protection-vault-prolok.html
63•kmm•5d ago•6 comments

Was Benoit Mandelbrot a hedgehog or a fox?

https://arxiv.org/abs/2602.01122
19•bikenaga•3d ago•4 comments

Dark Alley Mathematics

https://blog.szczepan.org/blog/three-points/
90•quibono•4d ago•21 comments

How to effectively write quality code with AI

https://heidenstedt.org/posts/2026/how-to-effectively-write-quality-code-with-ai/
256•i5heu•17h ago•196 comments

Delimited Continuations vs. Lwt for Threads

https://mirageos.org/blog/delimcc-vs-lwt
32•romes•4d ago•3 comments

What Is Ruliology?

https://writings.stephenwolfram.com/2026/01/what-is-ruliology/
44•helloplanets•4d ago•42 comments

Where did all the starships go?

https://www.datawrapper.de/blog/science-fiction-decline
12•speckx•3d ago•5 comments

Introducing the Developer Knowledge API and MCP Server

https://developers.googleblog.com/introducing-the-developer-knowledge-api-and-mcp-server/
59•gfortaine•12h ago•25 comments

Female Asian Elephant Calf Born at the Smithsonian National Zoo

https://www.si.edu/newsdesk/releases/female-asian-elephant-calf-born-smithsonians-national-zoo-an...
33•gmays•9h ago•12 comments

I now assume that all ads on Apple news are scams

https://kirkville.com/i-now-assume-that-all-ads-on-apple-news-are-scams/
1066•cdrnsf•23h ago•446 comments

I spent 5 years in DevOps – Solutions engineering gave me what I was missing

https://infisical.com/blog/devops-to-solutions-engineering
150•vmatsiiako•19h ago•67 comments

Understanding Neural Network, Visually

https://visualrambling.space/neural-network/
288•surprisetalk•3d ago•43 comments

Why I Joined OpenAI

https://www.brendangregg.com/blog/2026-02-07/why-i-joined-openai.html
149•SerCe•10h ago•138 comments

Learning from context is harder than we thought

https://hy.tencent.com/research/100025?langVersion=en
183•limoce•3d ago•98 comments

Show HN: R3forth, a ColorForth-inspired language with a tiny VM

https://github.com/phreda4/r3
73•phreda4•13h ago•14 comments
Open in hackernews

Algebraic Semantics for Machine Knitting

https://uwplse.org/2025/03/31/Algebraic-Knitting.html
246•PaulHoule•9mo ago

Comments

ruined•9mo ago
the formalization of textile programming really brings computer science full-circle. as a neoluddite i approve
speerer•9mo ago
...as demonstrated by the analogy in the original post here, where he explains the concrete concept of knitting stitches by reference to the much more abstract concept of garbage collection in computer programming!
dwlg00•9mo ago
Braid groups are really interesting, and they also come up in fluid mixing: https://people.math.wisc.edu/~thiffeault/talks/gordon2022.pd...
tucnak•9mo ago
The slides are a blast, thanks

Classic mathematicians!

bregma•9mo ago
Back in the 1980s I was taking a foundational computer science course in which we derived Goedel's result using Cantor diagonalization. Excellent course. We were watching the TV version of Hitchhiker's Guide to the Galaxy at the time, too. One day I had the realization that since any recursively enumerable function could be interpreted as a computer program (given the right interpreter), that the sweater I was wearing was in fact possibly a computer program, and that all knitting (and some crocheting) was in fact just a manifestation of code in another language.

I then went on to realize any enumerable set could be similarly interpreted, including the entire countable population of Earth. And we already had the answer (42), but what was the question?

gwern•9mo ago
I suppose if nothing else, you could encode Wang tiles (https://en.wikipedia.org/wiki/Wang_tile) into knitting and then that's Turing-complete? Or would there be some better CA to encode?
internet_rand0•9mo ago
sorry, 42 is not gonna take us much farther

42 is a stand in for 41 and 43 which are some twin prime

for me to further elaborate on this crazy idea that haunts me (I must admit I also haunt these ideas) requires a twin prime theorem which we are still waiting for in 2025....

Y_Y•9mo ago
Does anyone know a good emulator for knitting machines? I'd love to play with these programs, but I'd like to get some practice before I start messing with real wool.
MikeTheGreat•9mo ago
Possibly off-topic, but if you're looking to reduce your costs you should look at acrylic yarn. There's also cotton yarn if you're looking for something less scratchy :)
camblomquist•9mo ago
Someone else mentioned the acrylic, I'm going to mention Scarlett Sparks' Open Source Knitting Machine if part of the fear is actually investing in the machine https://github.com/ScarlettSparks/KnittingMachine
kappasan•9mo ago
Speaking of computational knitting, I recently learned about "solid knitting" [1] which is awesome.

https://www.cs.cmu.edu/news/2024/solid-knitting

fc417fc802•9mo ago
That also links to an older piece about a software project for knitting machines that's really neat. I've been wondering for a while how difficult it would be to build a primitive one at home.

https://www.cs.cmu.edu/news/2018/software-automatically-gene...

nolamark•9mo ago
As for build a primitive one at home, (assuming one == machine controlled knitting machine) see the journey of Gerard Rubio from OpenKnit to Kniterate

https://www.labonthecheap.com/the-openknit-machine/ https://www.kniterate.com

nolamark•9mo ago
If out are willing to move the carriage back and forth manually, and transfer yarn manually (for increases and decreases, etc.), the route to go is buy an electronic Brother machine and replace the electronics. The old standard was the AYAB board that you constructed yourself. (the evilmadscientist.com version is no longer in production) https://www.ravelry.com/groups/ayab for help and to meet fellow travelers. (circuit board and components: https://www.etsy.com/shop/redpinkgreen)

The less DIY more professional looking way is the recently released eKnitter, which replaces the electronics, but in a manner that more closely resembles the original form factor of the machine. https://eknitter.com/produkt/eknitter/

nolamark•9mo ago
Okay, one last project to share. If you are more a start from zero sort of person, see this wonderful set of videos on designing a 3d printable manual knitting machine. Realistically, more of a wonderful educational process you should see, than an economically viable one. (Meaning you can buy used mass produced hardware for cheaper.)

https://www.youtube.com/watch?v=kUKiXIdw2pI&list=PLWDnfcUpk7...

fc417fc802•9mo ago
I'm really glad I scrolled back a ways. This is awesome (so are the others ofc).
WillAdams•9mo ago
Still kicking myself for not buying a "3D Knitted Chisel Roll" back when Lee Valley had them --- last I checked it might have been possible to import one from Europe, but having a hard time justifying that.....
t-trash•9mo ago
Reminds me of the work in the Carnegie Melon Textile Lab on the semantics and scheduling for knitting machine compilers (https://textiles-lab.github.io/publications/2023-knitout-sem...)
nolamark•9mo ago
"This work is in part a collaboration with folks currently and previously at CMU, including Jenny Lin, Tom Price, Jim McCann, and Hannah Fechtner."
statusfailed•9mo ago
I've been hoping for a nice concrete example of braided monoidal categories for ages, who knew that the best one was string diagrams that represent actual string! Great post!

@the author - I assume you're aware that morphisms in symmetric monoidal categories can be represented using cospans of hypergraphs - do you know if there's a similar combinatorial representation for braided monoidal categories?