skysight-inc/HackerNews huggingface dataset:
Original post author here, thanks for your comments.

There is a robust second hand market for ultrasound systems and probes, just google for those companies or search on eBay.

There are also research platforms out there for imaging from various universities, some of which are open source. They aren't nearly as good as the commercial codes, but a few grad students can't compete against teams of full time professionals working for decades. Commercial codes are unlikely to be open sourced. Many are tied to the architecture of the systems, and most are reused in later systems and so are still useful decades later. It's highly unlikely that any company would open source them, it's just not how they operate.

As for explosions of technology and advances - yes, I do expect more advanced electronics and signal processing to have a large impact on ultrasound in the coming years, but it is more complex than most in this thread give credit for, and will take time to appear.
A metric buttload.
Interior Designers all think differently?
The rendering equation. Because the fact that it's hard to evaluate means I have a job.
In the form you wrote it, there are no real applications. But, written as $e^{i\theta} = \cos \theta + i \sin \theta$, it's frequently used in complex analysis and other areas.
Previous discussion: https://news.ycombinator.com/item?id=13247548
That's Amazon's MO.
I live in LA too and my girlfriend is a frequent guest on a huge Youtube channel.

The majority of people who recognize her are kids from Sunday school. It's hilarious and their parents have no idea what's going on.
I'll bet many of these are the same jobs where people are expected to be responsive during their off-hours regardless of whether they're on-call.
Frank Tipler is the main person proposing this, and he wrote about FAP in The Physics of Immortality: https://www.amazon.com/Physics-Immortality-Modern-Cosmology-...

Here's a review: http://www.fourmilab.ch/documents/tipler.html

And here's a quote from it: "it would be possible for each male to be matched not merely with the most beautiful woman in the world . . . but to be matched with the most beautiful woman whose existence is logically possible."

verifiable here: http://articles.chicagotribune.com/1994-11-30/features/94113...

I have his previous book, co-written with John Barrow, The Anthropic Cosmological Principle. It's taken more seriously.
It's really just a nice result of euler's theorem:

e^(a * i) = cos(a) + i * sin(a)

Where `a` is the angle in radians and `i` is `sqrt(-1)`
Quick answer - yes, GPUs are now reaching the point that they are becoming useful, but also imaging techniques such as superresolution methods, ultra fast imaging, and others, demand even more computation. I expect to see advancements in the next few years because of this, and at some point (maybe 10+ years from now), that GPU power will exceed the demand from ultrasound and even the highest end systems can use them for all needs. This is not lost on the community and they are working on exactly that kind of research.
I also felt it meandered; the message was not enough to sustain the whole movie.

It also felt a bit like '28 days'; after about half-way it went low-budget and lost it's way story-wise.
There is usually a separate fixed percentage of assets fee for just this reason, typically 1%.
Buildings have a host of different floor arrangements. In elevators, you'll see P1, P2 (parking), L (lobby), B (basement), LB (lower basement), UB (upper basement), M ("middle" floors, for buildings that have staggered floors), etc...

Most elevators must know the name of the floor they're passing by (since they display it). But if you ship a speech system that just pronounces each symbol (e.g. "Floor pee one" or "Floor ell"), it may initially be confusing for most passengers ("What is 'floor ell'?"). A well-polished solution is going to take more effort by both the vendor and the client (and if it's not well-polished, the feature's likely to be considered a wart by those who don't actually need it).

Plus, a beeper just needs to be audible - distortion is totally acceptable. A speech system will need a higher-spec'd amplifier and speakers (so that both components behave linearly over the full signal range) for the speech to be comprehensible.

Far from insurmountable, but I think it'd be an error to say that there isn't more cost in announcing floor names than just beeping as you pass a floor. It's almost definitely marginal in the scheme of building costs, but it's there.
Shaw wifi in Canada is actually pretty good, considering the general incompetence of our telecoms. Just about every business in the Calgary area that's a Shaw internet customer offers it, it's reasonably fast, sign-in is simple, and you stay signed in for a reasonably long time without jumping through hoops. The only catch is you have to be a Shaw home internet customer to access it, you can't just get standalone wifi access.
Which is the correct approach if you need a debunking of whether there are alligators in the swears, but if they are expanding their business to fact checking moralistic/political claims, how would that then differ from you seeking them for for moral guidance?
Sure, but why does it stop? It doesn't seem to be a specific population density, but culture + economics.

Like for example, look at this Haiti plot: https://knoema.com/atlas/Haiti/Population-density

It is already 1.5x more dense than Germany. 3x more dense than China. Would it stop? When?

Why is Switzerland 9x more dense than Ireland? Is population of Ireland expected to eventually grow to that of Switzerland?
I actually just mocked up the inverse, out of curiosity:

http://imgur.com/a/nPpsL

IMHO, at least, it does look better.
Concerns me that the person doing that job couldn't connect the dots of kids using parent's devices.

What I see is an industry of independent content developers who have gotten very close to the simplest form possible of "push button, receive dopamine."

As an upcoming parent, I feel I just need to not overreact and be moderate. Like TV in the 1900s, I just need to not rely on YouTube to babysit my kids.

Also, maybe they're advertising a credit card to the parent or guardian that's nearby. ;)
Black-Scholes Equation [1]

Oh so many reasons to love it and hate it

[1] http://www.espenhaug.com/black_scholes.html
That metric is likely multi-core performance. Contrarily, since JS is single-threaded (usually), the very weak single cores in a mobile processor don't do as well.
Sorry, as someone who worked with faces, I can't believe this has no false negatives
A math professor of mine once said of this (paraphrased): yes it is cool, but really it is just a trivial consequence of how we defined our extension of the real exponential map to complex numbers. The really cool part, is that this extension is the _only_ possible holomorphic (differentiable for complex numbers) extension. All that to say that the really nifty part of this identity is the uniqueness of analytic continuations (on the whole complex plane).
something similar would be "Off to be a Wizard" - would absolutely recommend it
Just a reminder to people, All The Tropes is a fork of TV Tropes, but everything is under a free license and has no advertising. TV Tropes uses a nonfree license.[1] The same page is available here: https://allthetropes.org/wiki/Unintentional_Period_Piece

[1]: At least under Stallman's definition of nonfree: https://www.gnu.org/philosophy/words-to-avoid.en.html#Creati...
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Arguably we could argue that everything flips 1's to 0's and back under the hood, though. Instantiation of a new lexical environment with fresh bindings mutates something in the machine.
(1) This is a clever implementation. Maybe with a mobile camera it can be even more convenient to use?
(2) True knowledge work requires breaks, and can not be measured with simple metrics like "boss watch what on screen" or "lines of code"
(3) Even true knowledge workers can get into a non productive youtube loop, and sometimes external influence helps to prevent procrastination
(4) If your relationship with the boss is based on these types of system, you better look for another place where you are respected 360 for your contribution
(5) We should respect people that can not easily find interesting work or bosses that respect you
(6) Communication, context and respect are always better than authority, hierarchy, and politics. Alas, humans can be very good at both
(Assuming US differs and jobs here)
A six figure income is way below 99%. It's below 90% for most six figure earners in the US. You need seven figures to get to the top 1%.
I know smart people who worked very hard in high school and university who aren't even in the 90%.
In fact, you are very unlikely to get into the 1% based on things you learn in college. You mostly have to be in finance or run a successful business to get there, or be quite lucky.
Reminds me of:

http://pcottle.github.io/MSOutlookit/

http://pcottle.github.io/MSWorddit/

http://codereddit.com
>Concerns me that the person doing that job couldn't connect the dots of kids using parent's devices.

I wouldn't be surprised they actually did connect the dots but it was in their best interest it says it was a middle age mother.
i watch a lot of niche hobby channels (not gaming) on youtube as a primary activity. there is some very, very good content out there. many shows get made that would never pass muster at a "tv network".

these people are able to make enough from youtube to either supplement a good professional income, or replace it altogether. which makes everyone, both producer and viewer, very happy indeed.
Clever Facebook Hack Reveals Private Email Address of Any User
The normal equation:
https://essentialproject.files.wordpress.com/2013/12/normal-...

used to find the line of best fit.

The first time I saw it I was in high school and I was watching Andrew Ng's machine learning class for the first time.
My Math background was not the best and I didn't fully understand it until a couple of years later when I took MIT's free online course on linear algebra (OCW 18.06)
We're a civilization of drug addicts, addicted to that hit of chemicals -- we as a species have always been like this, but the environment that we have created for ourselves is not engineered properly in that it does not regulated that hit properly. Good parenting is not going to fix that, it might delay it. But kids grow up and then they buy and do whatever they want, learning self-regulation is difficult if not impossible in the candyland our desires have created.
Ha, I never considered that. It would fit with the data-smuggling theme of Johnny Mnemonic (the short story, at least), which is set in the same universe.
A six-figure income does not put you in the top 1%. $100k/yr doesn't even get you into the top 20%. To get into the top 1% you have to make more than $500k/yr.

http://www.investmentu.com/article/detail/35049/mailbag-how-...
Sure. Flipkart and Snapdeal are not thinking (or have plans that they have declared publicly) of becoming Multi-Nationals to compete with the likes of Amazon and Ebay. Compare that with Alibaba which already has a US arm. I can, as an Indian, browse Amazon US shops and order from them (I of course have to pay shipping + duty on top of the original order). This isn't possible with Flipkart/Snapdeal. Even their local shops have lesser inventory and lesser options in comparison to Amazon India. Since India is a growing economy (and soon to be a less-cash economy), we will very soon get accustomed to purchasing goods and services online (like we did with mobile adoption). Once we do, there is no stopping us from purchasing goods and services from countries outside India as well (which was until recently just next to impossible for the lay man). Unless Flipkart/Snapdeal can cater to that market as well it's losing a big chunk of it's customers.

India is definitely poised to become a booming e-commerce market in the future but it has no where near peaked for these companies to be content with. The consumer market is still heavily dominated by the US and European countries. If they do not expand they are doomed.

And this is not restricted to e-commerce players alone. I notice this even with payment gateways / payment processors. We have quite a lot of payment processors that have a strong local presence. Some are even as good as Stripe (see Razorpay) when it comes to API and ease of implementation. But then again, they have no ambitions to expand to other countries. So India essentially has no access to an International payment gateway (Paypal doesn't count as it's only used for remittances. There is no equivalent of Paypal IPN/Paypal Express Checkout/Paypal Marketplace). To disrupt these companies, all it takes is for Stripe to open shop in India. Nobody would then have any incentive to use these payment gateways and they'll start seeing their market share diminish.
I wish they would just pass a law banning office spaces without doors.
Believe it or not, that's a thing, and it's called 'keistering'! Apparently, pro's can get a cellphone 'keistered'. But I think the flip-phone style, not an iPhone.

As far as microsd cards -- I think you'd be able to 'keister' many many terabytes. They are so tiny and so thin, I'd guess hundreds would fit.
Not completely true. There's a process of tenders

http://www.indianrailways.gov.in/tenders.html
The first plain JavaScript plugin that can add drag-and-drop sorting to your table
Usenet Computer YArchive
Deep learning algorithms wouldn't have the cultural significance that snopes has nor the 'credibility' and trust factor they sort of cultivated in debunking those type of myths non-nonpartisan myths. Also deep learning is no panacea.
Your link is slightly misleading - it shows ways of approximating solutions to the equation. The equation itself is a partial differential equation [1].

dV/dt + 1/2*sigma²*S²*d²V/dS² + r*S*dV/dS - r*V = 0

[1] https://en.wikipedia.org/wiki/Black–Scholes_equation
I worked in a gated, enclosed, guarded community in a Central American country with a bunch of expats - British, Canadian, American - and saw nothing but abject poverty outside of our small enclosure. Everything was delivered. McDonalds, Pizza Hut, local food, drinks, newspapers, groceries...

We had transportation to the local office and I saw much the same as you, but in way worse conditions.

It affected me just the same as you. I didn't last very long before taking a remote assignment and going back home.
No it is not. There are yubikeys that implement U2F but Yubikeys also provide more. In this case, their specific U2F key is not listed as requirement. So this is most likely not implemented using U2F.
Much of this is due to Amari, who got really into merging theoretical neuroscience and IG, e.g. http://www.mitpressjournals.org/doi/abs/10.1162/089976602602...
Unless you're just super pressed for resources I'm not sure why you wouldn't just install the omnibus then disable the services you don't want.
Why Stackoverflow sucks ass
> there isn't a way to test this

http://mnras.oxfordjournals.org/content/162/4/307.abstract discusses observables of such metrics, especially Gödel's.

A 2009 overview (postdating COBE, for example): http://iopscience.iop.org/article/10.1088/0004-637X/703/1/35... (preprint: https://arxiv.org/abs/0902.4575)

> 2/3 LIGO detections imply one of the merging pair of black holes should be a naked singularity.

Where did you get that from?

It's sure not prominent on the caltech or mit sites, or indeed in Pretorius et al. https://arxiv.org/abs/1603.08955
Allow me to correct your corrections about what is actually going on.

In other words, let me fact-check your fact-check.

You beg the question by claiming that only "self confirming nonsense" and "propagandist nonsense" will be hidden from the public, calling any position that sees cause for concern about censorship "a pretense." However, you offer no evidence for your claim that only these types of content will be affected. In fact, Snopes and many of the other fact-checkers have been shown to be politically biased themselves, and they certainly don't limit themselves to debunking propagandist nonsense. If we take their past performance as evidence of what is likely to happen moving forward, we will see, just for example a conservatives shut out of the public conversation for saying exactly the same thing a liberal is given a pass on. For claiming that nothing but truly egregious content could possibly ever be filtered, you receive 2 long noses.

Your claim that "the argument has now deteriorated into the surreal position that no-one (e.g. Snopes) should dare even post corrections to politically motivated lies" is blatantly false and receives 3 more long noses. Pretending that the fact-checkers have never told politically motivated lies themselves—only corrections—gives 1 extra long nose. Your claim that the argument goes so far as to say that nobody should promulgate corrections to political lies is exactly the opposite of the truth, earning you 4 more long noses. The whole goal is to leave every lie open for correction, by anybody who is able to offer a compelling case and back it up such that people trust the correction.

The objection is against setting official truth-setters, because that divides people into two classes: 1. people who are allowed to think for themselves and check facts, and 2. everybody else, who must, for their own safety and well-being, have the first class filter what they read.
Because our Universe is neither infinitely old (is about ~14 thousand millions years old) nor infinitely large (is about 90 thousand millions ly in diameter)

You have just suggested the universe expands at roughly 6c, no?
There's a croudsourced site which offers some information related to this.

https://indiarailinfo.com
is about 90 thousand millions ly in diameter

This is the diameter of the observable universe. We don't know if the universe is infinitely big, but all signs (e.g. the flatness of space as far as we can measure it) point to it being infinite, or very very much larger than our observable sphere.

I don't understand why I'm constantly having to inform smart people of this very basic fact. Is there something wrong with the way we teach astronomy? Can you help me spread the word?
That's called nostalgia. But it isn't as good as it used to be in the 1990's.
At some point in my past I became biased towards inequalities over equalities; they somehow seemed more fundamental (I have no intention to defend this sentiment... its probably insubstantial). So there are lots of fun inequalities, but probably my favorite is the bound on the support of eigenvalues of a matrix given by the Gershgorin circle theorem (https://en.wikipedia.org/wiki/Gershgorin_circle_theorem).
> i read a bit about fixed size arrays in it and the fact
> that 32 is the largest fixed size array

This is exceptionally mistaken, where did you read it? Arrays in Rust top out at the maximum value of a platform-sized pointer, which is either 2^32 or 2^64 depending on platform.
Please don't post nationalistic slights here. Everybody has an endless supply of these things to sling at one another if they get going. Therefore, don't get going.

We detached this comment from https://news.ycombinator.com/item?id=13248373 and marked it off-topic.
This is off topic in so many ways. HN is no place for political and ideological battle, regardless of the politics you espouse. Please don't post like this here.

We detached this subthread from https://news.ycombinator.com/item?id=13248463 and marked it off-topic.
de Broglie: E = h * nu

It comes up so often! Whenever someone asks what's new, the answer, of course, is "E over h." :-)
Ask HN: What are some great fiction reads for someone that reads non-fiction
Most of my reading recently has been non-fiction, and I'm looking for recommended good fiction books to read.

Any must read fiction?
Bollywood Dangal – Football – Undersea – Eena Meena Deeka
Please don't respond to bad comments by making the thread still worse.
Product Roadmapping
When I talk about willingness I'm talking about expanding Internationally to compete with the likes of Amazon and Ebay. Alibaba (http://www.forbes.com/sites/helenwang/2015/07/08/why-amazon-...) is already doing that.

India is definitely poised to become a booming e-commerce market but it has no where near peaked for Flipkart/Snapdeal to be content with. They just cannot depend on the Indian marketplace alone. Just because we are 1.25 billion strong and will probably adopt cashless means does not automatically make us a market for Flipkart/Snapdeal. They have to compete to get the marketshare. The market is dictated by one who is not just innovative but also caters to all sections of the diverse society. Sadly, only Amazon is able to currently provide a complete experience even though it's a late entry into the Indian marketplace. Flipkart/Snapdeal is already losing a major portion of their marketshare to Amazon and that decline is going to continue unless they expand and compete directly with Amazon in their own turf. Innovation alone cannot sustain Flipkart/Snapdeal.

The consumer market is still heavily dominated by the US and European countries. If they do not expand they are doomed. They do not have enough cash to compete with the likes of Amazon/Ebay who have a better inventory and provide access to the global marketplace.
>There are boards that have numbers like 1, 2, on them, and in small letters, below them, the coach number...

But only in very few stations, right? And you should be on the right platform in the first place, which defeats the whole purpose, because you can know the coach position a lot before you can know the platform. ie when the train starts as opposed to just before arriving at a station..
Ironically, of course, the only workable solution to the demographic crises in Europe and Japan is immigration. Otherwise, pension responsibilities will overwhelm the working-age population and the whole society will collapse.

Staving off a demographic crisis using mass migration of middle class people from developing nations is a bit like staving off a petrochemical crisis by fracking or digging up national parks for coal. You're just shifting the problem to another time period and making irreversible changes to your country. It's not at all sustainable.

Global population will peak, so eventually every country will have to come to terms with an ageing population. In many ways, Japan is trail blazer here while the west has its head in the sand.
Single threaded? Why not use futures?
I do appreciate being called a "condescending asshat", I might get a t-shirt with that on it, thanks.

I though my credentials were one paragraph instead of many, but maybe I need to count again.

As for lording it over you with qualifications - I just needed to make it clear that I actually do have a huge amount of experience in this area, otherwise instead of being a "condescending asshat" people would be asking who the hell do I think I am commentating on this.

I make no apology for knowing what I'm talking about, there's too many articles written by people with no idea about the topic.

And don't take it personally, I've something of a reputation in ultrasound for being blunt.
Sure suing is expensive, but threatening to sue is quite easy.
Snowden has always come off to me as a very what you see is what you get kind of person. Largely because he seems so dull (because he's not out drumming up attention, I suppose).
In a discussion on the subject on Facebook I commented: "I'd wager it was partially related to the fact that conservatives were far more likely to share fake/biased news stories than liberals. Note, of course, that liberals were far from immune as demonstrated by sharing the likes of Blue Nation Review, Daily News Bin, etc."