MurphyA/hacker-news huggingface dataset:
by godelski | 2025-10-21 23:07:17+00:00
> Physical systems governed by classical mechanics are reversible just by perfectly inverting all forces, velocities, and rotations

This doesn't really make sense. To do that you'd have to end up bringing in quantum dynamics, and well... we know how that goes.

Heat is probably the best example, as even if you were able to track the movement of particles individually you'd have a very difficult time putting them back in order. The development of thermal stat-mech is one of the things that led to the quantum revolution and "new physics". But if you only have a "calculus" based understanding of physics you likely aren't going to be familiar with this. It's not much discussed (it is some) if you didn't start entering upper division physics classes or equivalent coursework. It really shows up when you get into the weeds, but understandably it isn't something stressed before then. Physics is hard enough...

Not all classical physics is time symmetric[0].

FWIW, I don't think the article is unclear. I mean they address your point in the first sentence of the second paragraph

> Intuitively, it feels like the only way to undo a complicated sequence of rotations is by painstakingly doing the exact opposite motions one by one.

[0] There are examples on this page that do not require relativity or quantum mechanics, even though some do. https://en.wikipedia.org/wiki/T-symmetry

[note]: The real paradigm shift in quantum mechanics was that there was information that we could not access. That's what Schrodinger's Cat is about. The cat doesn't sit inside a parallel universe, a quantum superposition. It is just that there is no way to know which of the states the cat is in without opening the box. It says that we cannot have infinite precision, therefore must use statistics. So Einstein's "god doesn't play dice" comment is about that there must be some way to pull back that curtain.
by noir_lord | 2025-10-21 23:08:16+00:00
That seems like a solid place to start, I’d still be wary about supply chain though, using honey as an example just having bee hives doesn’t mean the honey going in the post came from them.

This is an issue a lot of retailers have tbh, it’s why the scandal w/honey came to mind since it was in the press again recently.

Good luck though, it’s an interesting idea, we use our local farmers market occasionally and some of the stuff (ironically honey is a good example) is incredible.
by pixl97 | 2025-10-21 23:08:17+00:00
>If more people refuse to do this type of work

This is kind of like saying "if people wouldn't murder other people then..."

"Bad" kind of work always finds bodies to fill it's spots. Boycotts of a particular business might work, but a type of work won't, especially when there is decent money on the table. And then when you start adding in people that had previous run ins with law enforcement and find it hard to get a "legit" job and get a decent offer from a place like this, they'll have no problem taking it.
by 35fbe7d3d5b9 | 2025-10-21 23:08:23+00:00
> Do the chicken go back in to sleep before dusk?

Yes - they are remarkably consistent in following the sun. Most automated doors wait until well past dusk, after which all the birds are up.

> Do the predators never attack during the day?

Raccoons and hawks are the predators I have had to worry about the most. Of them, raccoons are primarily nocturnal, and hawks are best dealt with by having plenty of covered spaces in your run and a rooster to watch the skies.
by StarterPro | 2025-10-21 23:09:26+00:00
So you'll never need to remember anything. ChatGPT remembers that PH video from 10 months ago AND the improved recipe for your mom's pasta sauce.

In all seriousness: they won't make a dent in the browser market, people still using GPT resources for free, and if they do start ads why would a company work with a company that's already hemorrhaging billions?

If you stop thinking (a tough ask for ai users, I know) about this from a never-ending money perspective and live in the real world, financially and environmentally it's gonna take decades to undo the damage. All for what?
by quickthrowman | 2025-10-21 23:09:26+00:00
> Difficult if you're not there though? Whereas a smart bulb/switch can turn it on when you're not there (crime deterrence)

This 24 hour timer can turn on two devices (lamps) on for whatever time interval you program, it’s $12: https://www.homedepot.com/p/Defiant-15-Amp-24-Hour-Indoor-Pl...

It consists of a mechanical timer, a dial, and a relay. It plugs into a receptacle. It does not require an internet connection.

> or when you're almost home (handy in hallway with no light.)

This wall switch occupancy sensor that can switch 2A (240 watts at 120V, more than enough for one hallway) is $23, it’s a decora device so figure $2 more for a 1-gang stainless decora wall plate (or less than buck if you go with plastic!): https://www.homedepot.com/p/Lutron-Maestro-Motion-Sensor-Swi...

Wall switch occ sensors get more expensive as the current they can switch gets higher, one that can do 6A is $87: https://www.homedepot.com/p/Lutron-Maestro-Dual-Tech-Motion-...

However, that much current can power (72) 10W LED recessed cans that each put out about ~1000 lumens. Or enough light for approximately 2400 square feet of interior space.

> (Niche uses, perhaps, but "I just use my hands" is reductive silliness.)

These are not niche functions, occupancy sensing and time of day scheduling are in basically every commercial lighting control system and fairly common in homes. They’re solved problems with cheap commodity devices available that don't require an internet connection.
by tadfisher | 2025-10-21 23:09:45+00:00
Crypto identities are identities, as much as human names or Social Security numbers. If you know who the identity represents, then you know that human's transaction history for all time on that blockchain.

Ballots do not have any identifying information, intentionally. There is no tracking number or possible mechanism to de-anonymize a ballot back to the human who cast it. Notably, there is not even a unique identifier for a single ballot that could potentially be used to identify a person.

Most importantly, there is no value that is unique to the ballot that I can use to verify that I am indeed the person who filled it out, so some nefarious organization could threaten me or my family to produce proof of how I voted. Or pay me, or influence me based on the outcome.

So there is no "identity" that you can record in a blockchain to prevent that identity from casting two ballots in the same election.
by panick21 | 2025-10-21 23:09:54+00:00
I'm not sure what are talking about. I don't like giving contracts to SpaceX because they are the right kind of people, I like it because they tend to deliver faster and at less cost with something more modern and more future looking.

While on the contrary Boieng and friends try to use old tech they have in their archive to slap togetehr a minimal viable product to meet the requirment.

But the contract structure changes is not about giving contract to SpaceX only. Its about developing a space industry. And this has worked extremely well. Commercial cargo resulted in Falcon 9, Antares rockets. Antares team is now working with the Firefly startup for a next generation rocket. Clearly not as successful as Falcon, but without Falcon on the market it might have delivered differently.

It also produce Cargo Dragon and Cygnus. Both have seen a lot of further development since then and have all kinds of uses.

You can also look at CLIPS for moon landers, where some companies at small budgets have managed to build landers. And even those that weren't successful, training a lot of people on deep space probes.

If you comapre the explosion of the space industry since Commercial Cargo to the stgantion in the Shuttle/Constellation area you will see why many space fans are so in favor of the new model. And the amazing thing is, that a tiny fraction of the money was spent on the non-Shuttle/Constellation/SLS part.

In fact, I did the math and the total spend on just development of Constellation/SLS/Orion is going toward 200 billion $ over the last 25 years. And that is without actually delivering anything meaningful.

In comparison the complete development budget of Commercial Cargo was a few billion $ at most, and it has revolutionized the US space industry. The complete spend on all Commerical Cargo, Commercial Crew and Lunar development more like 20 billion $. And the impact is just hilariously larger.

Seems fairly obious what the way forward is, its just politically not feasable. As long as 50% of NASA discretionary budget is spent on ISS and Shuttle-derived stuff that will never be forward looking, you are playing the game with a hand tied behind your back and cement shoes.
by sudahtigabulan | 2025-10-21 23:10:37+00:00
> If it happens a second time? A stern talk from their manager.

In my experience, the stern talk would probably go to you, for making the problem visible. The manager wouldn't want their manager to hear of any problems in the team. Makes them look bad, and probably lose on bonuses.

Happened to me often enough. What you described I would call a lucky exception.
by GuB-42 | 2025-10-21 23:10:41+00:00
It is not a nuclear fission facility, it is "a plant that produces the vast majority of critical non-nuclear components for US nuclear weapons".

The also targeted the IT side, not the operational side, which, according to the article is likely to be airgapped. Even sensitive production facilities need some internet access, people work there and like everyone else, they need food, office supplies, toilet paper, etc... they can't be cut off the rest of the world completely.
by forks | 2025-10-21 23:10:42+00:00
> The big problem that we kept running into was keeping everything in sync all the time. Every time we add a new user, organization, repository, etc. in our database, we also had to add the corresponding tuples in OpenFGA.

This is a fundamental problem with all Zanzibar-inspired authorization systems[0] that require centralizing ~all authorization data and led us @ Oso to build a more flexible system[1] that grants more control over what authorization-relevant data you centralize vs. decide keep locally.

0: https://www.osohq.com/post/authorization-for-the-rest-of-us

1: https://www.osohq.com/docs/develop/facts/local-authorization

disclosure: founding engineer at Oso
by FloorEgg | 2025-10-21 23:10:52+00:00
A conspiracy assumes secret cooperation, and I am not making any claim like that. I am merely pointing out that Elon has position himself as a rival against a lot of rich and powerful people. Rather than speculate on the specific arbitrary political reason, it might be mostly because of the underlying pressure or general anti-Elon baseline effect (and to attribute it to something more specific is a form of baseline or base rate neglect).

And to your point about him spending more money then the rest combined, maybe, he did spend a lot on twitter, but I don't think any of us can actually know how much all those people are spending. It might be closer than you think. Also the anti-Elon media brigade started long before he bought twitter, it just wasn't focused on the general public, it was focused on amateur investors.
by zozbot234 | 2025-10-21 23:10:59+00:00
Every garbage collector has to constantly sift through the entire reference graph of the running program to figure out what objects have become garbage. Generational GC's can trace through the oldest generations less often, but that's about it.

Tracing garbage collectors solve a single problem really really well - managing a complex, possibly cyclical reference graph, which is in fact inherent to some problems where GC is thus irreplaceable - and are just about terrible wrt. any other system-level or performance-related factor of evaluation.
by cat_plus_plus | 2025-10-21 23:11:07+00:00
No idea why Nvidia has such crusty torch prebuilds on their own hardware. Just finished installing unsloth on a Thor box for some finnetuning, it's a lengthy build marathon, thankfully aided by Grok giving commands/environment variables for the most part (one finishing touch is to install latest CUDA from nvidia website and then replace compiler executables in triton package with newer ones from CUDA).
by kulahan | 2025-10-21 23:11:55+00:00
It's probably worth considering that across a sufficiently large distance, they effectively no longer exist. Their signals haven't reached you, and with the increasing speed of the universe's expansion, they will never reach you. Eventually, everything will be expanding at well beyond the speed of light, so short of being able to cut through space and time, we're not reaching any of these destinations. For all intents and purposes, they don't exist for us. We'll never see any evidence, nor could we ever see any evidence.

So in reality, there is a maximum distance we need to consider - the distance where any signal would have any chance of reaching a detectable region.

But besides, this still misses the most important part. Until 10 billion years ago, stars were much too big and poor in metals and unstable. We didn't have an earth until 5 billion years ago. It was inhospitable to life for a LONG time. We've only had multicellular organisms of any kind for 800M years. Our star is unusually calm, meaning we don't have to worry about being bleached every 5 million years or whatever.

I've said this a couple times in this conversation, but the best guess is honestly that we're the forerunners.
by ternus | 2025-10-21 23:12:06+00:00
Artemis II is not on the pad. It's in the VAB, and it isn't stacked yet (source: my sister's an engineer with NASA Exploration Ground Support and is one of the people in charge of assembling it).

There's a lot left to do before it's ready to launch: https://spaceflightnow.com/2025/10/17/orion-spacecraft-arriv...

Of course, compared to the decades-long SLS timeline, that's "ready to go".
by globnomulous | 2025-10-21 23:12:19+00:00
> Evidently, I'm just imagining all the times my teachers went on strike in Illinois in the 2000s. There have not been any "right to work" laws in Illinois passed affecting teachers or firefighters since then. Evidently, it's all in my head that most blue states like IL, MN, MA, and NY have legal protections for public schoolteachers.

> I can't tell if you're honestly misguided or if you're an HR employee at Amazon trying to derail the thread

This isn't productive. It's belittling, snotty, and disrespectful. You're also clearly more than intelligent enough to recognize that you're putting in people's mouths claims they haven't made.
by NekkoDroid | 2025-10-21 23:12:23+00:00
> * Goes to find a Tylenol

Watch out that you don't catch the autism :) /s

> [1] https://github.com/votingworks/vxsuite/blob/main/Cargo.lock

> [2] https://github.com/votingworks/vxsuite/blob/main/pnpm-lock.y...

These files are actually cursed and I want all drives that contain their data destroyed with acid. But I have a slight feeling other voting software isn't really any better, even though in theory it should be relatively simple software in the grand scheme of things.
by netsharc | 2025-10-21 23:12:29+00:00
What does that "point of return" look like, and who's going to actually enforce it? The regime has ignored courts' orders... I feel like only a military coup can actually do anything now.

Because I expect the 2026 or 2028 elections to be held more with Russian, Turkish, or Hungarian standards rather than 80's Hollywood movie idea of America's standard. The Dems and courts are going to cry foul, and the regime will just laugh at their faces and continue to rule.
by panick21 | 2025-10-21 23:12:29+00:00
Not really, its only the big question if US makes it the question. If the US just says yeah we done that, that's not our focus.

And then China does maybe a flags and footprints landing, while shortly after the US has a base there.

The only reason this is even close at all is because the US spend the last 25 years and 200 billion $ in complete deadends.

And just going further into the deadend just to maybe get a set of footprints onto the moon first is shortsighted and frankly morinic strategy.
by loandbehold | 2025-10-21 23:13:08+00:00
People like Ray Kurzweil, Jürgen Schmidhuber, Leopold Aschenbrenner, Paul Christiano see a pathway out of this inevitability through technological singularity. In their vision humans are a seed to something greater, something noticeable on cosmic scales. In their vision, like early humans who emerged on the other end of genetic bottlenecks, today's humans will have a disproportionate effect on the future. According to the current models of cosmology heat death of universe in still inevitability but that's on a completely different timescale than human life.
by virtualminds | 2025-10-21 23:13:13+00:00
Hey HN,

We just released AI Video Generator: aiVideo — an iOS app by Virtual Minds that lets you create short, cinematic videos directly from text or images using multiple top-tier AI video models under one subscription.

App Store link: https://apps.apple.com/rs/app/ai-video-generator-aivideo/id6...

What it does:

Converts prompts or photos into cinematic, share-ready clips in seconds

Access to multiple generation engines — Sora 2, Veo 3, Wan, Kling, and others

Seamless model switching and comparison in one interface

Exports directly to the Photos app

Under the hood:

Built in React Native + UIKit, optimized for iOS

Prompt routing and model orchestration handled via Firebase Functions

Server-side generation with latency optimization and adaptive credit usage

Designed for creators who want to experiment with multiple models natively, without browser UIs

We built it to test the limits of mobile-first AI generation — from latency, UX flow, to model integration.

Would love feedback on:

Model orchestration strategies — what would you improve?

Whether an open API for developers to run model calls from mobile makes sense

Thoughts on latency vs quality trade-offs for multimodel routing

App Store: https://apps.apple.com/rs/app/ai-video-generator-aivideo/id6...

— Virtual Minds Team
by noir_lord | 2025-10-21 23:14:02+00:00
4) is same as three but you take a subset of the data with correct relations, anonymise it carefully and use that, it has a lot of complexity at scale but is about as faithful as I’ve seen, it’s also one of those tools that forever requires maintenance as the core db mutates.

For local devs, seeding the database with plausible correct data works pretty well.
by gregsadetsky | 2025-10-21 23:14:35+00:00
Although LLM generated, https://deepwiki.com/letsdiscodev/disco-daemon is pretty impressive and has some arch diagrams. But I fully agree, we should have that on the site.

Once everything is installed/running, a very tldr diagram would be:

GitHub (webhook on git push) -> Docker swarm running Caddy -> Disco Daemon REST API which will ask Docker to build the image, and then does a blue-green zero-time deployment swap

But yeah, a clearer/better diagram would be great. Thanks for the push!
by insane_dreamer | 2025-10-21 23:15:27+00:00
Epic Systems (healthcare, not gaming) has bucked this trend. They have the most amazing campus I've visited. With 10K+ employees on site.

They're also privately held, which makes a difference.

https://www.cnbc.com/2024/09/01/inside-epic-systems-mythical...

This is from 2022; they've built a number of new themed buildings since then, including Star Trek.

https://www.penick.net/digging/?p=82929

https://www.epic.com/visiting/
by gchamonlive | 2025-10-21 23:15:35+00:00
Now that you say, I have a new Lenovo yoga with those SoC ram with crazy parallel channel config (16gb spread across 8 dies of 2gb). It's noticeably faster than my Acer nitro with dual channel 16gb ddr5. I'll check that, but I'd say it's not what the average home user (and even server I'd risk saying) would have.
by dgunay | 2025-10-21 23:15:40+00:00
What about any tool, language, library, or codebase that is unnecessarily complex? Should we never bother to put in the effort to learn to use them? It doesn't mean they are without value to us as programmers. For better or worse, the hallmark of many good programmers I've met is a much higher than average tolerance for sitting down and just figuring out how something computer-related works instead of giving up and routing around it.
by kulahan | 2025-10-21 23:16:46+00:00
One mildly interesting fact that MANY Christians get wrong:

There is no lead-up to the apocalypse. The Messiah will return "like a thief in the night" and "nobody, except my Father, knows the hour of my return" (I probably butchered those two quotes). Either way, the Bible is pretty clear (as was Jesus): there will be zero indication the apocalypse is coming. None. It'll just... start.
by jjk166 | 2025-10-21 23:17:29+00:00
Well in the drawing analogy, they picked stainless steel while they were still trying to draw a sparrow.

Stainless steel was specifically chosen so that starship wouldn't need a heat shield and would survive re-entry with transpiration cooling. This would save substantial weight and make rapid reusability easy. The problem is that after designing starship around the stainless steel construction, they found that the transpiration cooling system wasn't workable, so now they have a stainless steel hull and a heat shield.

Further, I do not believe the drawbacks of stainless steel were fully appreciated at the time. Stainless steel on paper looks like it has better strength to weight ratio than aluminum, especially at the cryogenic temperatures of starship's fuel tanks. However a steel tank wall with the same strength as an aluminum wall is much thinner and so you wind up with different failure modes, namely buckling. In practice, a rocket made from steel is heavier than a rocket made from aluminum. This was why the Atlas rockets used stainless steel but subsequent rockets switched to aluminum in the first place.

Additionally, at the time much hooplah was made about stainless steel being cheaper and more formable which would reduce production costs. This is just nonsense. Stainless steel is expensive and tough to work with, which is why we don't use it for creating large structures despite its desirable material properties. It may be favorable compared to titanium, which was likely the only other option when transpiration cooling was the game plan, but for the current design aluminum would be far cheaper in addition to being lighter.

Now I'm sure SpaceX did some analysis after the transpiration cooling didn't work out and asked whether it made sense to start the design over and retool everything instead of continuing on with the stainless steel, and they decided at the time no. Since then they have had several further setbacks. The increased weight required them to reduce safety features, which may have contributed to some of its earlier losses. Starship has had to grow considerably and increase thrust to accommodate for these shortcomings. Would SpaceX have made the same decision to continue with the stainless with the benefit of hindsight? I can't say. But with the exception of a few chinese startups trying to carbon copy starship, other rocket manufacturers have not adopted stainless steel, likely with good reason.
by al_borland | 2025-10-21 23:18:00+00:00
I’m a little confused by your title after looking at the site. I thought this would be something to help choose an item to order, maybe providing a picture and more detail for a dish on the menu that the user isn’t familiar with. But on the site it says to take a picture of the food, so order was already placed, and this is more of a meal tracker, because you don’t trust the menu to allow you to fill out a macro tracker properly?