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

https://openciv3.org/
594•klaussilveira•11h ago•176 comments

The Waymo World Model

https://waymo.com/blog/2026/02/the-waymo-world-model-a-new-frontier-for-autonomous-driving-simula...
901•xnx•17h ago•545 comments

What Is Ruliology?

https://writings.stephenwolfram.com/2026/01/what-is-ruliology/
22•helloplanets•4d ago•17 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
95•matheusalmeida•1d ago•22 comments

Unseen Footage of Atari Battlezone Arcade Cabinet Production

https://arcadeblogger.com/2026/02/02/unseen-footage-of-atari-battlezone-cabinet-production/
28•videotopia•4d ago•0 comments

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

https://github.com/valdanylchuk/breezydemo
203•isitcontent•11h ago•24 comments

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

https://github.com/pydantic/monty
199•dmpetrov•12h ago•91 comments

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

https://vecti.com
313•vecti•13h ago•137 comments

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

https://github.com/microsoft/litebox
353•aktau•18h ago•176 comments

Sheldon Brown's Bicycle Technical Info

https://www.sheldonbrown.com/
355•ostacke•17h ago•92 comments

Hackers (1995) Animated Experience

https://hackers-1995.vercel.app/
459•todsacerdoti•19h ago•231 comments

Delimited Continuations vs. Lwt for Threads

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

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

https://eljojo.github.io/rememory/
259•eljojo•14h ago•155 comments

Dark Alley Mathematics

https://blog.szczepan.org/blog/three-points/
80•quibono•4d ago•19 comments

An Update on Heroku

https://www.heroku.com/blog/an-update-on-heroku/
392•lstoll•18h ago•266 comments

Was Benoit Mandelbrot a hedgehog or a fox?

https://arxiv.org/abs/2602.01122
7•bikenaga•3d ago•1 comments

PC Floppy Copy Protection: Vault Prolok

https://martypc.blogspot.com/2024/09/pc-floppy-copy-protection-vault-prolok.html
53•kmm•4d ago•3 comments

Vocal Guide – belt sing without killing yourself

https://jesperordrup.github.io/vocal-guide/
3•jesperordrup•1h ago•0 comments

How to effectively write quality code with AI

https://heidenstedt.org/posts/2026/how-to-effectively-write-quality-code-with-ai/
235•i5heu•14h ago•178 comments

Introducing the Developer Knowledge API and MCP Server

https://developers.googleblog.com/introducing-the-developer-knowledge-api-and-mcp-server/
46•gfortaine•9h ago•13 comments

Why I Joined OpenAI

https://www.brendangregg.com/blog/2026-02-07/why-i-joined-openai.html
122•SerCe•7h ago•103 comments

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

https://infisical.com/blog/devops-to-solutions-engineering
136•vmatsiiako•16h ago•60 comments

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

https://github.com/phreda4/r3
68•phreda4•11h ago•12 comments

Understanding Neural Network, Visually

https://visualrambling.space/neural-network/
271•surprisetalk•3d ago•37 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...
25•gmays•6h ago•7 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/
1044•cdrnsf•21h ago•431 comments

Zlob.h 100% POSIX and glibc compatible globbing lib that is faste and better

https://github.com/dmtrKovalenko/zlob
13•neogoose•4h ago•9 comments

Learning from context is harder than we thought

https://hy.tencent.com/research/100025?langVersion=en
171•limoce•3d ago•92 comments

FORTH? Really!?

https://rescrv.net/w/2026/02/06/associative
60•rescrv•19h ago•22 comments

Show HN: Smooth CLI – Token-efficient browser for AI agents

https://docs.smooth.sh/cli/overview
89•antves•1d ago•66 comments
Open in hackernews

New Process Uses Microbes to Create Valuable Materials from Urine

https://newscenter.lbl.gov/2025/06/17/new-process-uses-microbes-to-create-valuable-materials-from-urine/
52•gmays•7mo ago

Comments

LargoLasskhyfv•7mo ago
https://www.nature.com/articles/s41467-025-59416-8#Abs1

The valuable materials are artificial bone made from hydroxyapatite produced by yeast, used in bone surgery and dentistry.

kjkjadksj•7mo ago
Now imagine how big the market would be if people could actually get cosmetic dental work covered under insurance
LargoLasskhyfv•7mo ago
There is no need to imagine that. It depends on the country, and your insurance. I've experienced it, not personally, because no need so far (phew!). But when I grew up that was free, for all. Like glasses, too.

Still don't really care, because now it would be covered by my private insurance. If not they'd get sued into oblivion really fast, even if I would be incapacitated somehow.

schiffern•7mo ago
Also check out the CodysLab version of biological urine reuse (aka the giant aquarium filter):

https://www.youtube.com/watch?v=fhYW0QVS408

Great channel. Quite a shame to hear about Cody's burnout after constant issues getting paid by YouTube, and apparently dating problems with the stigma associated with "youtuber."

analog31•7mo ago
Not the first time that urine has been used as a raw material at scale

https://www.yorkshirepost.co.uk/whats-on/arts-and-entertainm...

ChuckMcM•7mo ago
This is an interesting paper. I had read about recycling cow urine in dairies[1] and I wonder if the yeast would be able to make hydroxypatite out of it. At the time I came across this paper I was looking at people creating financial incentives to produce ammonia (and ammonium nitrate) at scale for farming. We import a bunch of it[2] and making it locally would be a win/win.

[1] https://www.sciencedirect.com/science/article/abs/pii/B97801...

[2] https://wits.worldbank.org/trade/comtrade/en/country/USA/yea...

icoder•7mo ago
Here in the Netherlands the impact of Nitrogen coming from cattle excretions (mostly through ammonia I believe) is paralizing the entire country (due to the impact on the environment, it's now blocking the building of - very much needed - housing. So there could be a win/win/win/win there.
throwaway77385•7mo ago
Interesting. First time I've heard of this outside the UK. In my local area, there's a near total moratorium on new-builds. The reasons are complex, but it's a mixture of agriculture having poisoned all the rivers, housing which is not connected to mains waste water (and people just not maintaining their private waste water systems, which are often just tanks of excrement mixed with chemicals, overflowing into nature) and, even if houses connected to mains, those constantly overflow into storm drains and make the rivers and coasts dangerous to swim in. All of that while it's completely clear that if we need one thing, it's more housing. Quite a predicament we find ourselves in.
amy214•7mo ago
California is like this, for different reasons. Mostly the leaders think nature > humanity so the more they cap the knees of civilization, more for nature, and that's a good and meaningful legacy in their minds. Of course this is a politically dangerous thing to speak up about publicly, so it's more along the lines of "uhhh we need to make sure the house you build is safe, so you need 50,000 pages describing how safe it is, must be evaluated by an army of Phds, and rejections take 5 years"
pstuart•7mo ago
There are startups doing it directly from air (with solar power): e.g., https://www.talusag.com/

There's lots of exciting development in this space and I hope they can thrive in a world owned by fossil fuel companies.

interestica•7mo ago
Check out the Rich Earth Institute in Vermont. They're doing cool experimentation and research.

https://richearthinstitute.org/

thayne•7mo ago
Cool

But is there enough demand for this to make it economical? I would guess the cost of material would be a very small percentage of the cost pf operations that use hydroxyapatite.

WalterBright•7mo ago
Urine has historically been used to create gunpowder.

The Romans used urine as laundry detergent.

schiffern•7mo ago
If the Romans had only known, they could've used chewed watermelon seeds which contain urease. Adding this catalyst greatly speeds up the volatilization reaction from 3-5 weeks to overnight,[0] eliminating the need for Roman laundries to buffer weeks worth of urine as they wait for it to turn into ammonia.

There's a reason why Roman laundries were usually located just outside the city, ideally on the downwind side...

[0] https://www.researchgate.net/publication/291165299_Citrullus...

Scoundreller•7mo ago
Even a single seed did the job per that study.

Only problem was that watermelon didn’t hit the European side of the empire until the endish

aitchnyu•7mo ago
A city which had shared toilet sponges would be known for being stinky by lots of authors.
jrflowers•7mo ago
Finally, a way to turn urine into bones. I’ve been saying “we need to find a way to turn urine into bones” for years and people told me that it couldn’t be done
v3ss0n•7mo ago
So as in the the acient alchemy wisdom describe in Emerald Tablet