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

https://openciv3.org/
487•klaussilveira•7h ago•130 comments

The Waymo World Model

https://waymo.com/blog/2026/02/the-waymo-world-model-a-new-frontier-for-autonomous-driving-simula...
826•xnx•13h ago•495 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
48•matheusalmeida•1d ago•5 comments

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

https://github.com/valdanylchuk/breezydemo
163•isitcontent•8h ago•18 comments

A century of hair samples proves leaded gas ban worked

https://arstechnica.com/science/2026/02/a-century-of-hair-samples-proves-leaded-gas-ban-worked/
103•jnord•3d ago•14 comments

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

https://github.com/pydantic/monty
159•dmpetrov•8h ago•73 comments

Dark Alley Mathematics

https://blog.szczepan.org/blog/three-points/
57•quibono•4d ago•9 comments

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

https://vecti.com
267•vecti•10h ago•126 comments

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

https://github.com/microsoft/litebox
334•aktau•14h ago•161 comments

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

https://eljojo.github.io/rememory/
216•eljojo•10h ago•136 comments

Sheldon Brown's Bicycle Technical Info

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329•ostacke•13h ago•87 comments

PC Floppy Copy Protection: Vault Prolok

https://martypc.blogspot.com/2024/09/pc-floppy-copy-protection-vault-prolok.html
31•kmm•4d ago•1 comments

Hackers (1995) Animated Experience

https://hackers-1995.vercel.app/
417•todsacerdoti•15h ago•220 comments

Show HN: ARM64 Android Dev Kit

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9•denuoweb•1d ago•0 comments

Delimited Continuations vs. Lwt for Threads

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8•romes•4d ago•1 comments

An Update on Heroku

https://www.heroku.com/blog/an-update-on-heroku/
349•lstoll•14h ago•245 comments

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

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55•phreda4•7h ago•9 comments

How to effectively write quality code with AI

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205•i5heu•10h ago•149 comments

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

https://infisical.com/blog/devops-to-solutions-engineering
117•vmatsiiako•12h ago•43 comments

Introducing the Developer Knowledge API and MCP Server

https://developers.googleblog.com/introducing-the-developer-knowledge-api-and-mcp-server/
30•gfortaine•5h ago•4 comments

Learning from context is harder than we thought

https://hy.tencent.com/research/100025?langVersion=en
155•limoce•3d ago•79 comments

Understanding Neural Network, Visually

https://visualrambling.space/neural-network/
254•surprisetalk•3d ago•32 comments

I now assume that all ads on Apple news are scams

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1008•cdrnsf•17h ago•421 comments

FORTH? Really!?

https://rescrv.net/w/2026/02/06/associative
50•rescrv•15h ago•17 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...
11•gmays•3h ago•2 comments

I'm going to cure my girlfriend's brain tumor

https://andrewjrod.substack.com/p/im-going-to-cure-my-girlfriends-brain
82•ray__•4h ago•40 comments

Evaluating and mitigating the growing risk of LLM-discovered 0-days

https://red.anthropic.com/2026/zero-days/
41•lebovic•1d ago•12 comments

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

https://docs.smooth.sh/cli/overview
78•antves•1d ago•59 comments

How virtual textures work

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32•betamark•15h ago•28 comments

Show HN: Slack CLI for Agents

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41•nwparker•1d ago•11 comments
Open in hackernews

The append-and-review note

https://karpathy.bearblog.dev/the-append-and-review-note/
91•vinhnx•6mo ago

Comments

redhale•6mo ago
I didn't have a name for it, but I evolved to this same exact system myself. I use HeyNote [0] for mine.

[0] https://heynote.com/

adamtaylor_13•6mo ago
This seems almost uselessly simple to me. The “cognitive overhead” of a list of notes feels trivial considering this is a person who managed to put their words online.

The issue isn’t cognitive overhead, it’s not having rituals to review and refine your thoughts. Everyone has to jot down ideas from time to time, but if you never take time to stop, review, and organize your thoughts then sure it’ll feel like a lot of cognitive overhead.

meribold•6mo ago
> person who managed to put their words online

He also managed to do quite a lot of other things: https://en.wikipedia.org/wiki/Andrej_Karpathy

mananaysiempre•6mo ago
The person is also quite good at specifically putting their words online in a way that others can benefit from them. (Enough so that it’s a bit of a running joke[1] when he quits his job and has time to write some more words.) That skill is generally difficult to transmit, so if they’re saying something in that direction it could be worth listening.

[1] https://news.ycombinator.com/item?id=39365638

getnormality•6mo ago
> The issue isn’t cognitive overhead, it’s not having rituals to review and refine your thoughts.

It is called the append and review note, so I think the blog author engages with your point and agrees with it?

meribold•6mo ago
This system seems quite similar to sending messages to oneself on Signal/Telegram/whatever. What I like about using messenger apps is that every note gets a timestamp and that messenger apps are, in my experience, more polished than note-taking apps.
loloquwowndueo•6mo ago
Then you’re at the mercy of a third party service for access to your notes.
meribold•6mo ago
That depends on the messenger app. Telegram, for instance, supports backing up messages as HTML and/or JSON.
camwest•6mo ago
This feels similar to a GitHub issue.

1. Editable description 2. Comments

getnormality•6mo ago
Why does the perfect note-taking system seem to be such blogging catnip? And the post always basically says "here's my system", never "here's why taking notes is valuable" or "here's something objectively valuable that was enabled by my note-taking system".

By the way, here's my note-taking system: https://renormalize.substack.com/p/my-markdown-project-manag...

All joking aside, append-and-review does seem like a nice pattern for maintaining attention on a big heap of odds and ends, which is probably useful for a researcher like Andrej Karpathy.

thejohnconway•6mo ago
I find it pretty mysterious, and am starting to think it's distributed bike-shedding. I'd wager most notes, if they are ever taken, are write-only. Seems like a distraction to me.
loloquwowndueo•6mo ago
A funny thing happens where, if I don’t write something down, I’m more likely to forget it than if I do. So I write things down!

If I happen to indeed forget, I’m one grep away from finding what I wrote about the topic based on some vague keyword.

getnormality•6mo ago
I have been a huge note-taker for many years, but it's mostly about tracking projects and tasks at work and home that I need to be accountable for. Whereas a lot of the recent trendiness around note-taking seems to be more like, looking for a system that is going to capture every insight you have or interesting tidbit of information you encounter, and this is going to reveal things to you.

But what people seem to find is, if a system requires a lot of work and doesn't show any benefits, they give it up pretty fast. Which is why a super simple system like TFA's is probably the only sustainable thing if you just want to remember "stuff" you hope will be useful later.

wodenokoto•6mo ago
Yes, about 90% of notes are write only. But it’s usually worth it for the last 10% percent.
fellowniusmonk•6mo ago
The problem is the appification of doing, data/structure should have apptributes, we should live in the structure not the function, I have a personal client that I've solved all my issues with, I've got a fair amount of polish before I can release it, but it's effectively my OS at this point.

The nice side effect is that other than chatting with agents it solves the issue of getting sucked into feeds as everything external is a single feed curated by my cluster of ai agents.

Its basically an OS for creators.

dzink•6mo ago
Because in a world where everything decays, including most physical objects and your health, your ideas preserved is the only thing that may remain of you in the end.
convolvatron•6mo ago
if that's your goal, I don't think you can count on future generations to try to deconstruct your notes unless you've made some other pretty historically significant contributions. you should be writing essays and academic papers.
fellowniusmonk•6mo ago
In the future it will be easier to mine private notes for novelty.

I've developed a pretty unqiue approach to naturalistic non-arbitrary universally binding morality that has fixed my Ai alignment issues (without being able to retrain their model off their weird utilitarianism), but I'm not highly motivated to share it, it'll get around eventually if humanity doesn't implode.

pratikdeoghare•6mo ago
I also use a single text file. I have developed my own notation to give it some structure [1]. I have a parser for the notation that creates tree of the document. Then I write various programs that walk the tree and do cool things. I have been happy(didn't feel like I needed anything else) with my system for some years now.

Checkout the video: https://youtu.be/CpcsOiETgxA

[1] https://github.com/PratikDeoghare/brashtag

Apologies for low quality of video and code. :)

-----------

Example file:

  ```
         [x*x for x in range(10)]
  ```
  #out{}

Now if notebook program is watching the file then it will send the code block to jupyter server and write results to `#out{}` "bag". And file will look like this.

  ```
         [x*x for x in range(10)]
  ```
  #out{
         ````````````````````````````````````````````        
         [0, 1, 4, 9, 16, 25, 36, 49, 64, 81]
         ````````````````````````````````````````````}
cube2222•6mo ago
Most of my attempts at note taking usually end up devolving to this. Not to say it’s a bad thing, I think it’s effective enough.

I may keep separate append-and-review topics per major area (work, personal, cooking) but that’s about it.

Usually in form of an outline / list, append in the front, and with deeply nested sub-points, as I “discuss with myself in writing”.

ltiger•6mo ago
Same, except I append to the bottom of an Apple note.

(I append, the author's really prepending. Anyway...)

When the note gets too long, I cut and paste it to what I call the big note: a 127000-line, 4.9 MB text file I've been maintaining for 14 years.

Trivially searchable, can get context from neighboring notes (What else was happening around this time?), and easily parsable when necessary.

ltiger•6mo ago
[Reviews current note...] Oh, I do both! - Prepend todos to the top, append notes at the bottom.
linkage•6mo ago
Ok but todos have a time cost. It takes time to watch a YouTube video or read a book or make a slide deck. Todos often have deadlines as well. You can't capture all of this in an unstructured text file unless you create your own grammar (like what Andrej showed). Even after that, you need to visualize what's in progress and what's blocked because of some other todo, and before you know it, you have reinvented a shittier version of Linear.
another_twist•6mo ago
Next up: everybody claims this the best way to do note taking. Single note on Apple notes is now all the rage and single-noting startups crop up in droves. Give this man a breather honestly.
hkon•6mo ago
I can already visualize the accompanying YouTube thumbnails.
outlore•6mo ago
I used to like Reflect Notes which had an "infinite " scrolling daily note. Are there any other similar apps to that? it's kind of nice to have everything laid out on one screen but i need a little more structure than Karpathy's single note which feels more brittle somehow
mud_dauber•6mo ago
I use RememberTheMilk for this work - especially the notes feature for appending thoughts. Giving items a due date ensures I need to review things.
Noumenon72•6mo ago
An important part of this system would be, when do you ever review? Everyplace I do this, I never check it, because when do I ever have nothing to do?
titanomachy•6mo ago
> when do I ever have nothing to do

my dude you’re literally on Hacker News right now

ravelantunes•6mo ago
I do it similarly, but I still start another note every week, as it “feels cleaner”. I find that the global search works pretty well on Apple Notes, and by splitting by week I get a sense of around when I might have taken that note, which is helpful sometimes.
dzink•6mo ago
After using Apple, and OneNote (which suddenly became unusable thanks to syncing becoming paid without warning) and others, I noticed in some cases the software was wiping the bottom of my large notes (or maybe not syncing them). Confirm indeed that the bottom of your increasingly large note is still there. Also need some method to backup or verify integrity of content added, because Microsoft wiping OneNote sync is one of many ways those services betray your memories and leave you empty handed.
koinedad•6mo ago
I just use it to store anything in small tiny notes and then use the excellent indexing and search to find what I’m looking for on my phone or laptop.
ccorcos•6mo ago
I do something very similar but I add to the bottom instead of the top. It keeps things chronological which is nice when referring back to things.

It’s also much more similar to how you would take notes on paper or in a notebook.

I just wish some note taking app would have a setting that allows me to open a note at the bottom instead of the top!

ErikBjare•6mo ago
This feels pretty similar to how many PKMs use a "Daily Notes Page" (Roam, Obsidian, Logseq, etc)
swaits•6mo ago
For anyone interested, I hacked together a little command line tool to implement this system. Find it at: https://github.com/swaits/ldr