skysight-inc/HackerNews huggingface dataset:
> can we use the usual hack for defining an invariant energy of defining the center of our coordinate system to be the center of mass of the volume?

A volume by itself doesn't have a center of mass. If you are talking about a standard FRW model where the energy density and pressure are constant in any given spacelike slice of constant FRW coordinate time, then you can pick a particular sub-volume of a spacelike slice and define the spatial center of FRW coordinates to be the geometric center of the sub-volume, and that point will also be the center of mass (or more properly the center of energy-momentum) of the stress-energy in the sub-volume.

Since all of the stress-energy is comoving in this model, you can pick out the set of comoving worldlines that are in the sub-volume at the instant of FRW coordinate time that you chose, and treat them as a "system", whose center of energy-momentum will be the comoving worldline at the spatial origin of FRW coordinates, and that will be true for all time. The issue comes with trying to define a "total energy" for this "system"; you still run up against the same issues I described.

> can we meaningfully ask questions like "you have a toy universe with two gravitationally bound masses

There is no known exact solution that describes this case, so the only way to treat it would be by numerical simulation. Astronomers do do this, for example to model binary pulsar systems (as in the Hulse-Taylor binary pulsar observations that won them the Nobel Prize). However--

> does expansion increase the energy of this system in the center of mass reference frame?"

Such a "universe", in the numerical simulations, will not be expanding. It will be asymptotically flat, and will slowly emit gravitational waves and become more tightly bound (this was the prediction that Hulse and Taylor's observations over many years verified). In short, this "toy universe" has nothing useful in common with our actual expanding universe.

In terms of energy, the ADM energy of such a system will be constant. The Bondi energy will slowly decrease with time as gravitational waves escape to infinity. But again, this system is not expanding, so these things tell you nothing useful about an expanding universe.

> I guess this is probably just equivalent to ADM/Bondi, since the spacetime is asymptotically flat.

You guess correctly. See above.
Ask HN: How to get ready to develop for Apple Vision?
Persona A: (Myself) Experienced software developer who knows the math for 3-d geometry, optics and such and can work the problems but has never developed with anything like Unity. Frequently one of the first if not the first to be out with a demo with a new technology. Expects a hardware and software budget of about $5k including the headset and an M2 mac.

Makes inkjet prints of photographs, art reproductions and such. Would like to put a QR code next to a print that would be linked to an AR and a VR experience. For AR additional information would be projected on the wall next to the print, but I'd also like to invite the user to visit a "land", for instance, an art gallery where they can view that art and related art.

Thinks it is important that such an experience can also be experienced on a mobile phone or desktop computer.

Persona B: Owner of several Thai restaurants in a small city. Master of SEO and social media marketing, dominates the SERPs for his business area in his town and has thought a lot about his relationship with food delivery services and such. Spends $100 a day for an ad in the newspaper, could be sold on a $30,000 project (done by a local shop that makes mobile apps and web sites, maybe even Persona A) based on some combination of the business case and appeal to vanity.

Imagines a project similar to Persona A's but is focused towards building a brand or facilitating commerce.

Persona C: Maybe Persona B doesn't have the resources to succeed at this or decides it isn't worth it. Persona C is a similar person but in a larger organization with a budget 10x-100x larger. Imagine somebody doing marketing for Taco Bell.

---

What does it take to create this kind of experience? How does somebody prepare now to be delivering this kind of experience in 6 months to 1 year?
There are of course some niche distris that aren't based on the "big ones".

But I'm not sure Slackware is still at this point relevant enough to be named in a row with the others I've mentioned.

Of course the sampling was subjective, and I didn't intended to marginalize any not mentioned distris. I just thought the others are too niche to be included in such kind of pick.
There was always garbage, you just don't remember it.
It's worth playing around with ChatGPT for YouTube video ideas. You can give ChatGPT titles of popular video in your niche and then ask it to output similar title ideas that are likely to do well on your channel. Then ask it to generate script outlines for those videos.

Here's a useful video from Matt Wolfe: https://www.youtube.com/watch?v=ka1Pqk2o3tM&t=612s
you are aware that his mind was harmed when he was a child at Harvard, right?

See https://exploringyourmind.com/the-harvard-experiment-that-le....
Ted Kaczynski Dead At age 81
If there is a viewpoint you want people to think about, it would be much more productive to just state what it is.
The bottom line is, the batteries that you would need do not exist yet. You just have faith that your extrapolation holds true. I cannot comment on that either way, because there is no way to tell when battery energy densities will stop improving.

Synthetic kerosene is a technology that we have today and imho the most likely option because it is plug and play. Otherwise one would have to work out many modifications to fly directly on hydrogen, but that is also technically possible today, if one wanted to do it that way.
Taking code off github, changing it a bit and passing it off as ones own crosses a line. Now we really can't tell the AI from the humans!
This is incredible!! For all the “AI is stealing our music” naysayers here consider that all art is derivative or it lacks context and makes it nonsensical, and artists learn too.
I like that
> Like any interesting pursuit, scientific publishing struggles to keep up with developments in technology.

I'm going to keep that in mind, there does seem to be this interesting human nature presumption that everyone keeps in sync with the latest and greatest. But that's simply not the case.
> Maybe D had executable examples that were tested by the compiler before Go

Sounds like D's ability to specify unit tests in production source code, and have them optionally executed, fits the bill for that.

https://dlang.org/spec/unittest.html

Builtin unit tests were a great leap forward for code verification.
Eh, defense in depth, if we make a huge mess of overlapping detection systems, good luck inserting a compiler quine to bypass them all.
Trump shouldn't blatently commit crimes if he doesn't want to be charged with them.

Willful retention of national defense information: This charge, covering counts 1-31, only applies to Trump and is for allegedly storing 31 such documents at Mar-a-Lago.

Conspiracy to obstruct justice: Trump and Nauta, along with others, are charged with conspiring to keep those documents from the grand jury.

Withholding a document or a record: Trump and Nauta are accused of misleading one of their attorneys by moving boxes of classified documents so the attorney could not find or introduce them to the grand jury.

Corruptly concealing a document or record: This pertains to the Trump and Nauta's alleged attempts to hide the boxes of classified documents from the attorney.
Concealing a document in a federal investigation: They are accused of hiding Trump's continued possession of those documents at Mar-a-Lago from the FBI and causing a false certificate to be submitted to the FBI.

Scheme to conceal: This is for the allegation that Trump and Nauta hid Trump's continued possession of those materials from the FBI and the grand jury.

False statements and representations: This count concerns statements that Trump allegedly caused another one of his attorneys to make to the FBI and grand jury in early June regarding the results of the search at Mar-a-Lago.

False statements and representations: This final count accuses Nauta of giving false answers during a voluntary interview with the FBI in late May.

According to the indictment, each one of those charges carries a maximum fine of $250,000, with maximum prison sentences between five and 20 years.
I dunno MS took a really long time to recover it's peak. Even if you didn't buy the top it stayed flat for a very long time. Not that it happens in every instance, but at some point in managing it you have to consider opportunity cost, call a loser a loser, and pull out. 15 years to break even and that's without taking inflation into account.
DCA is really about managing behavior rather than volatility or return. It's hard for many people to put a lump sum in the market, even if they agree it's the right thing to do. It's behaviorally easier to put X% in today and the rest on a schedule than to make the decision to put the lump sum in today. It's better to start the process than to waffle on if today is the day or not.
I won’t speak to music, as I listen to a lot of stuff, enough to know there is good stuff out there being made.

But for movies and TV? Where do I find the good stuff? It seems Hollywood is creatively bankrupt and just milking people off boring franchises and cheap nostalgia through crappy remakes and sequels. My eyes rolled to the back of my head when I saw an ad for a show called “how I met your father” on Hulu.
The waterfall approach plus tunnel vision. Highly effective for getting things done in a team of one with no overarching goals.
You really have to dig for good music these days. The record industry is a zombie at this point and no longer does the job of discovering good music. It just churns out utterly formulaic pop that might as well be the output of a music generator like this.
Nature is not an art magazine.
It seems as though the submitter is also the article author and changed it on the page to match the HN title.

https://web.archive.org/web/20230117212610/https://bitfieldc...

This is an interesting conundrum. Clearly the new title was chosen because it sounds more alluring; I mean, it hit the front page. But also, the OP could've easily done this prior to submitting and it would be totally normal, since people adjust article and post titles all the time.

Does come off as mildly sneaky when you do it in this order, but maybe I'm just nitpicky.
That's very interesting, any sources?
Because it needs to be hallucinated.
Or maybe the only kind of geo engineering that is feasible comes with unknowns that people are reasonably suspicous of; especially when it would likely be carried out by profit making entites.

If you want to suck co2 out of the air, no one will have issue with it, you will just run out of money without making a dent.
I realize the logic is criminals go where the money is but crime is just so weird.

I mean unless it's a one-shot deal, sooner or later you are going to be caught and then end up with consequences for everything.

Yeah I know, not deep thinkers but still, this is way more effort than smash'n'grab car windows in the parking lot, they have to think out a little in the future with that level of commitment.
This usually comes up because people procrastinate investing and end up with a large amount of money sitting idle. They have anxiety about how to put it into the markets.

Saving with each paycheck isn’t dollar cost averaging. It’s lump sum. DCA would be something like putting 1/4 of your total savings every week.

Anyway, in my experience this situation comes up a lot due to the above
Yep -- I think that if self-driving cars prevented all accidents, but each year one self-driving car randomly drove at max speed into the side of a Walmart, people would reject that trade. I think of myself as fairly logical, and I'd have a hard time accepting that. The Trolley Problem is hard.
TDP reduction = heat management = reliability management but mostly noise management.

I've never tried to water cool a 125 watt processor and so I can't speak to that. But especially if one uses air cooling or ideally passive cooling, one's ability to reduce noise is proportional to the chip's TDP. Noise reduction is important to many.
Why?

Entertainment? Trying to make money? Hobby?
Exactly. The median person with AI concerns is nowhere near Yud, but I have seen him influence the discourse so much that to me, AI concerns = Yud.
Too late, the AI bros already did.
But how does it make him a hypocrite?
Even if you think it's linear, there's no reason why you need to be a dollar maximizer, or even an average dollar maximizer. You could instead maximze the 85th percentile dollar value or something like that to be more safe.
So sad, they already broke that rule in the first image they included.
It was also a Palantir engineer that helped Cambridge Analytica with the data analysis of Kogan Facebook psychological profiles that they used to psyop Trump into the Whitehouse and Johnson into 10 Downing Street. Karp handily threw that employee under the bus, and 'absolved the company of guilt'.
I think this is missing the key change licensing would effect: it would crush the profit margins involved. I think that alone would drastically reduce 'AI risk' (or more importantly the negative effects of AI) because it would remove the motivation to build a company like OpenAI.
The View from Inside Beatlemania
It's not about forgiveness, it's about the story. MKUltra is a critical factor in this tale. And from a journalistic and social point of view, society would be a far better place if more people knew about MKUltra [1] than do. Beyond that it's also important to ever emphasize that actions have consequences which may not always be easy to predict. One of the countless reasons Machiavellianism is absolutely idiotic.

[1] - https://en.wikipedia.org/wiki/MKUltra
Elevator music was indeed what came to my mind when listening to the examples.
Theres loads of good music out there, it's just become extremely hard to find unless you're all in on scouring niche subreddits and soundcloud.
Is there more precise and credible information about MKUltra program and Ted K.?
Boeing sued for alleged fraud, theft of tool designs and leaking fluid
The one thing I still wonder about Ted is actually how many more actually good and thought provoking "manifestos" like his are out there, only for nobody to push them to in the public's eye.

After all, almost all smart people that identify uncomfortable truths won't go to extremes to convince strangers of actually giving their non-mainstream ideas a chance.
GCP automatically lowered our quota, caused an incident, and refused to upgrade
> and also eliminates a lot of the need to copy data from RAM to VRAM, as both the GPU and the CPU can access the same memory. In return, this allows the GPU to match the performance of discrete GPUs that have a lot more cores.

Plenty of PC hardware reviewers have done sensitivity analysis experiments to see how discrete GPU performance is affected by running with a slower or narrower PCIe link. The consensus is usually that GPUs connected by PCIe have more than sufficient bandwidth, and cutting it in half only affects gaming framerates by a few percent. Tighter coupling between CPU and GPU can plausibly have a bigger impact for some GPU compute workloads, but for traditional 3D graphics it doesn't help performance much.
This is why I paid extra for services like Tidal and Roon. Their music recommendations are just better than any AI-driven stuff. Need actually human experts to curate playlists and such. I feel like the alg-based stuff is just a race to the middle.
This is a nonsensical sensationalized article. I don't think the block feature is going anywhere. The main source of the article is the following vague tweet by Musk, in response to complaints about mass blocking [1]:

> Blocking public posts makes no sense. It needs to be deprecated in favor of a stronger form of mute.

TBH, the tweet doesn't quite make sense to me, but it definitely isn't an announcement that the general block feature is going away.

[1]: https://twitter.com/elonmusk/status/1666594707621773312
I don’t disagree that property value is a ritualized social fiction, but there are some glaring errors in this.

Namely they define value = future earnings / discount rate, and then when showing the example with Amazon use past earnings.

Clarification: typically[1] future earnings = sum of all future cash flows, which is different than profits. Businesses (or a music catalog) keep making money and don’t just pay out once.

It’s an arbitrary formula too, but they’re not staying consistent with their arbitrary formulas.

And there is some effort to find a mathematical basis for the discount rate, e.g. CAPM [2]. Actual asset prices often are inconsistent with this and other models of the discount rate. Lots of hand wringing ensues and nobel prizes in economics are dolled out.

[1] https://en.m.wikipedia.org/wiki/Discounted_cash_flow
[2] https://en.m.wikipedia.org/wiki/Capital_asset_pricing_model
Gettin high on skooma no doubt
While possibly true, the US has been nearly continuously engaged in conflict somewhere in the world since WWII.
https://news.ycombinator.com/newsguidelines.html

Please don't post insinuations about astroturfing, shilling, brigading, foreign agents, and the like. It degrades discussion and is usually mistaken. If you're worried about abuse, email hn@ycombinator.com and we'll look at the data.
> If it matters ethically

When you use the word 'it', are you referring to "giving credit", or the question "Do I need to give credit"?

The former would mean "If giving credit matters ethically, then asking the question provides the answer [which is yes.]". But that's just asking the same question as OP. Does giving credit matter?

The latter would mean "If you felt like you might need to give credit, that the answer to that question matters ethically, then that provides the answer [which is yes, you need to give credit]". But that sounds wrong to me. That kind of logic would turn every positive impulse into an instant obligation.
Not really. It's a lot of disorganized nonsense with a high noise-to-signal ratio. Random excerpts:

> 14. Feminists are desperately anxious to prove that women are as strong and as capable as men. Clearly they are nagged by a fear that women may NOT be as strong and as capable as men.

> 15. Leftists tend to hate anything that has an image of being strong, good and successful. They hate America, they hate Western civilization, they hate white males, they hate rationality. The reasons that leftists give for hating the West, etc. clearly do not correspond with their real motives. They SAY they hate the West because it is warlike, imperialistic, sexist, ethnocentric and so forth, but where these same faults appear in socialist countries or in primitive cultures, the leftist finds excuses for them, or at best he GRUDGINGLY admits that they exist; whereas he ENTHUSIASTICALLY points out (and often greatly exaggerates) these faults where they appear in Western civilization. Thus it is clear that these faults are not the leftist’s real motive for hating America and the West. He hates America and the West because they are strong and successful.

> 22. If our society had no social problems at all, the leftists would have to INVENT problems in order to provide themselves with an excuse for making a fuss.

> 35. Everyone has goals; if nothing else, to obtain the physical necessities of life: food, water and whatever clothing and shelter are made necessary by the climate. But the leisured aristocrat obtains these things without effort. Hence his boredom and demoralization.
No, I don't want to influence him it's way easier to see the prejudice of other people if you let them think for themselves.
I'm mostly trolling to stir the pot and see HN's response, and you don't disappoint. :)

But since we're all speculating here, if I had to place my money on who will come out on top with AI, it would be the East. And by East, I specifically mean China.

While the West is scrambling to limit the pace of AI development, no such regulation exists in China. There have certainly been regulations to limit the power of Chinese companies in the past few years, but ultimately the shot caller is the CCP. An autocracy has more power and influence to direct its resources in a single direction much more efficiently than any democratic government.

Then there's the manufacturing side. The West does still control the most advanced chip fabrication technologies, but China is quickly ramping up development with results that rival those of TSMC/ASML[1]. If any country can be self-sufficient with chip fabrication, it's China. There's only so much harm US sanctions can do to a self-sufficient country.

[1]: https://thediplomat.com/2022/08/chinas-semiconductor-breakth...
> Blowing people up is wrong.

So is performing torture experiments on them to see what happens them locking them up when they crack.
I don't think Sharpe is the right metric here and it has the same flaw as the article. Neither the article nor the sharpe ratio would take into account the fact that in his test much of the capital would remain uninvested for the begining of the dollar cost averaging strategy so it would seem to underperform literally because far less capital would be put to work for the beginning of the test period.

The use case for lump sum and dollar cost averaging (or "Systematic investment" that he mentions in the article, which sounds very much like what I have always called DCA but whatever) are different. Most people don't have a chunk of cash to invest, most people have some small amount of excess cash to invest each month or whatever. So in that world are you better off investing each month, or saving up until you have a lump sum? Almost certainly investing[1] each month.

For that reason, most people in the investment world would use some variant on internal rate of return here, which you could do a risk-adjusted variant of if you wanted to. I expect if you used either of those metrics you would find that DCA pays a small amount of excess return in cases when you would luck out and invest big after a decline in the lump sum case. In return for this, DCA has far lower variance, and far less likelihood of "effective ruin"[2].

[1] Technically if your savings amount each month is very small the transaction costs will eat up your capital if you trade too often so you should save until you have chunkier amounts in that case to mitigate this.

[2] Strictly if you're just investing long in cash equities (not derivs) risk of ruin is practically zero, but for a real person you can be very significantly harmed if say you bought equities at some high water mark, there is a big sell-off, the market basically goes sideways (declines in real terms after inflation) for a long period of time and you have to retire (so you have no earning power) and have to sell gradually at a loss to sustain your standard of living in retirement. This is effectively the position a lot of Japanese investors found themselves in after the big slump there.
How might one use a Large Language Model “to generate part or all of an image”?
Right? It's never been easier to spot, really.
DCA is about ease of implementation and regret minimisation, not ev optimisation.
(and now for the rare take that isn't your typical cynical/jaded internet comment)

Wow this is more than good enough to use for background music in video games, stores, commercials, etc..

You really could have super dynamic music in a video game for instance that changes based on the time of day, environment, situation, mood, etc.. all combined.

Combine it with a LLM DJ and you could get some fun radio stations.
Don’t forget the confirmation bias too! Who would have thought the people that go to the office think going to the office is good?!? Perhaps ask the remote workers how connected they feel…
I call it copyright laundering