skysight-inc/HackerNews huggingface dataset:
So I'm making iOS apps sometimes, but have not implemented a chat feature.

Why would I want to use this rather than a UITableView where I append the newest message in the end of the UITableView every time (you'd have to increase it's length +1 for each new message, but hey that may be ok)?
> They aren't linked—they are the same thing!

If you're speaking of time and space, no, they're different -- they're certainly all part of one spacetime, but they're distinct. This distinct:

t' = t √(1-v^2/c^2)

t = time

v = velocity

c = speed of light

t' = time at velocity v relative to velocity 0

Put into words, this special relativity relationship shows that an increase in velocity (movement in space) causes a reduction in time's rate of passing (movement in time). The general relativity version has more terms, and shows a relationship between mass and both space and time.

So space, time and mass aren't the same thing, but they're part of an interrelated system, one easily described mathematically.

> Time runs slower for us here inside the gravity well of Earth than it does for astronauts in zero gravity.

Yes, true, but astronauts in orbit aren't in zero gravity, they're in free-fall. The gravitational force at typical orbital heights is nearly as strong as it is at the surface.
"from Star Trek to Hollywood"

So... Hollywood? Star Trek wasn't filmed on location - Desilu and Paramount were both located in Hollywood.

Not that this, y'know, matters - just found it amusing.
Yes.

Also all traffic you sent through (meaning a lot of passwords) could have been sent somewhere.
You could move /bin/bash to another location, and then create a symlink from the Homebrew version to /bin/bash.
I've done this type of work before (porting Android to iOS, and porting iOS to Android), and it doesn't strike me as great for a subscription service - instead, just advertising that you are Android porting experts would probably be sufficient, if that's the market you want.

I'm not sure what the difference is between paying your company $5k/month for a year, for this Android-app-as-a-service, vs just paying your company $5k/month for consulting services (and maybe locking that in as a minimum spend).

On your end, you could end up losing a lot of money by not estimating the porting costs correctly, and quoting too low a rate.

Personally, I find that straight-up porting projects aren't very interesting (as a software developer), so I tend to take on projects where the client needs both iOS and Android apps developed from scratch.
I'm not a physicist. I imagine that if I were, this would be exciting news (that is, an exciting possibility).

I am a literary critic, though, and I have to say that it's bittersweet news at best. Black holes are so much a part of the space-age imagination. The article mentions Hollywood, but black holes are woven deeply into our everyday metaphors and have been for decades. They have stood among the most wondrous things in the universe -- an awe-inspiring thing.

It reminds me a bit of when the press reported that the Catholic Church had "gotten rid of Limbo" (the actual case was a bit more complex, and involved some fairly weighty theology).

Then again, we all still talk of things "being in Limbo." Perhaps that next project will still be a black hole, even if it turns out that there's no such thing.
Nice!

BTW: I am the author of an upcoming book on technical debt. I am looking to include case studies on technical debt in the book, and am looking for situations where there technical debt had an impact of at least $1 million (either gain or loss).

I'm a regular member of the HN community, so this isn't blind spam. I would like to request that if anyone has a story like this, that you reach out to me -- tim @ my-HN-username.com . I'm happy to have a totally off-the-record discussion if that works for you.

Thanks!
Try this out and let us know what you think. It's been designed in a way where you shouldn't care about the growing text input and trivial features related to it, but to build your tableView/collectionView cells and content.
That's the funny thing about assumptions...

In truth, what can happen is exactly the opposite: constant firing of pain signals can end up recruiting _more_ cells to transmit pain, thereby lowering the threshold need to signal pain, and amplifying the effect overall.

cf. http://en.wikipedia.org/wiki/Chronic_pain#Pathophysiology
That's absurd. I heard somewhere that Obama doesn't choose what he eats. He makes incredibly important decisions all day, every day. He can't be bothered to worry about what he's going to eat. Not many of us can make meaningful comparisons between our day-to-day and that of the POTUS, but I certainly envy the convenience of having my meals chosen for me. Cooking requires making a number of additional decisions. You suggest finding a recipe online. OK, well it will probably require ingredients that I don't have. Finding a satisfactory solution to the problem of choosing a recipe that maximizes tastiness and health, while minimizing grocery shopping and cooking hassle takes at least ten minutes for me. Inevitably, I need to buy four or five ingredients. Using up the leftover ingredients will further complicate future meal choices. Furthermore, cooking requires planning ahead of time unless you want to make a (10 minute minimum) trip to the store every day. So now I have to set aside 2-3 hours every week to make a meal plan, write a shopping list, and buy ingredients? Add an hour or more if you are not lucky enough to have a grocery store near your daily commute. And now I need cabinet and refrigerator space for all this and counter space to prepare the meal on.

Cooking's easy for you. Congratulations! It's not for me. You are out of touch with what day-to-day life is like for a huge swath of folks.
Discovered this page doing some research. Bert Bos being fairly prophetic about the next 15 years of CSS development: the majority of these have been added (in one fashion or another). Glad we don’t have ‘spreadsheet functions’ in a spec though, that feels solidly the preserve of JS.
ICARUS FIGHTS

MEDUSA ANGELS
Please don't use nothing but sarcasm in a post.
Spot on.

This is not hard work. I'm not sure exactly what was being done that made this take more than an hour.

On our kit, which is pretty hefty, I'd schedule a 30 minute window for a 150Gb ETL even with heavy transformations.

When we moved our stuff from Mongo to SQL Server it took an entire 6 minutes to drag 30Gb over including SQL full text. That was a 16 core Xeon with 64Gb of RAM and 15K SAS RAID 10 so not a big machine either.
If "Obamacare" did nothing else right, it ended the idea of lifetime maximum output by the insurance company, but it has just taken effect. This story is one where they were likely dropped from insurance after they reached their plan's maximum output and they're now left to fend for themselves.
It looks to me like the major thing here is the grace period right? Otherwise you could get "pointer-changing" happy and mess up readers traversing bucket lists right?
Sorry for the delayed response. See my answer to a similar question in this thread: https://news.ycombinator.com/item?id=8356999

If you have any more questions or just want to chat, feel free to shoot me an email directly at serge@parsehub.com
Thanks, wise words.
Just the first. on the strings "sum", "add", and potentially on the symbolic operation `args[0]+args[1]`.
Typing "la liga " in the address bar crashes Chrome on Android
Django and Python hacker Jose Padilla, linked to corruption and fraud case
https://www.anonyme.com/View/904b2a8e-564a-4b50-8ef8-be8eddcdd86b
Personally I find this lecture to be not very good - its full of anecdotal evidence, confirmation bias, and "no true Scotsman" arguments.
Amen. Will send later today.
I have a similar project, it's licensed under the GNU license. You can host it wherever you want to.

It's early in its development stage, and I would love all and any kinds of feedback.

[You can find it here](https://github.com/Azeirah/brainstorm)
Deep in the comments, 'slibc' is mentioned. I hadn't known about it, but this library provides str..._s() implementations of all the standard str...() functions as defined in Annex K of the C11 standard (which I also hadn't known about).

https://code.google.com/p/slibc/

At a glance, this seems like a better solution than any of alternatives: require the buffer length to always be specified, and call a user controlled handler instead of allowing an overflow. This handler defaults to abort().

While there are fine arguments to be made for using a real string library like bstring, are there downsides to the str_s approach compared to using the str, strp, or strl family of functions?
This issue arises even in completely single-threaded programs that have hash tables. Suppose you're iterating over a hash, hitting a callback function for each element which has access to the hash and inserts new elements. During the callback, new elements could be inserted which trigger a growth. If you allow the hash table reorganization, then it has to be reconciled with the in-progress traversal, so that it doesn't miss some elements, or visit some elements more than once.
Overview of Bank Data APIs
How often do you need cryptographically secure random floats? (I'm genuinely interested in the use cases.)
End around mobile carriers?

Wouldn't mind ditching mine, that's for sure.
Ah, got it!
iOS8 Foreground Processes
That's usually part of the ETL pipeline. If you look at SSIS and spring integration for example it has the ability to do this in the pipeline.
Would you like to sign up for a buggy minimum viable drug treatment?
Only HN somebody will compare cancer drugs to Pebble.
<< After nine years of doctor visits, operations, a lengthy trip to Mexico and a lawsuit filed against various hospitals for alleged medical malpractice, Joan says she and Rick have spent roughly $600,000 in search of relief for Justin. >>
SHELL SHOCK Unix, Linux gear vulnerable in big bad Bash bug blow
I've got a Debian VM I maintain for giggles, and just out of masochism I've been running "apt-get update" and "apt-get upgrade" for a while and watching nothing change.. Am I doing something wrong or is the whole process just slow?

deb http://http.debian.net/debian/ squeeze-lts main contrib non-free
deb-src http://http.debian.net/debian/ squeeze-lts main contrib non-free
You mean import the raw data into a json column and then SELECT DISTINCT INTO?

There are only 50 million rows... this sounds like a 5 minute query.
This is a perfect example of doing something row by row instead of in a data sets is bad for anything with over a million rows. Bulk Dump / Copy Load and then run the rules to clean up data.
I'm a little unclear, does this hook into your code, or is it just a REPL? If it doesn't hook, what would be the use case for this?
bzzt. The Konami code only has one "B, A".
Health incubator: the Golden stethosphone
This is pretty neat. I wonder how cost effective it is vs compressed fluid storage.
A Mildly Satanic New Video Game That You Can Only Play Online with Money
My favorite method of short-term energy storage at scale is to use excess energy during non-peak times to pump water uphill, back into a reservoir. The topology has to be right for it (and obviously it requires there to be plenty of excess water), but it's a simple method to smooth out peak demand.
> "Stephen Hawking used quantum mechanics to show that black holes emit radiation." I don't think this is true, or Hawking would have his Nobel prize by now

Hawking not getting a Nobel by now doesn't mean much. Einstein never got one for relativity (either Special or General), and when he did get his Nobel he was told not to mention "relativity" in his speech.
This is great. Appreciate the feedback :)
Author here, would love feedback on this, and also happy to answer any questions.
It was actually a combination of several queries in the first database followed by several inserts into postgresql.
The Apple A8 Mystery: What Do Two Billion New Transistors Buy You?
I was assuming he was moving the json into a structured foreign key-> data type of relationship
Pretty cool.

Zoom animation was choppy, quad core FF/mac.

`esc` key should zoom back out imo.
Oh man no, go take a look at the launchd sources and see how much is hard coded in for how Apple wanted it - likely when you run into something unexpectedly not working how you wanted or expected.
Have you noticed that movie trailers are going voiceless? (Odd 20 Year Trend)
This implements the input box, not the rest of it. Apparently, an automatically (vertically) expanding input box does not exist for iOS in the standard libraries for it.
If the spacetime is static, then yes, the trajectory of a light beam (or anything else) is reversible. The question you pose is an excellent one and is one of the reasons that many physicists believed that black holes could not exist after Karl Schwarzschild discovered the Schwarzschild metric that describes spacetime around a spherically symmetric black hole.

So what happens if you direct a beam of light radially into a black hole? A distant observer will calculate that as the light beam descends into the black hole it will be (according to a distant observer) progressively blueshifted until it reaches the event horizon, at which point it will have blueshifted to infinite energy. In fact, according to the calculations of a distant observer, the light beam will never cross the event horizon, so the statement that the light beam is reversible remains true. The reason that the light beam (according to the distant observer) doesn't cross the horizon is that if you look at the metric, it states that ds^2 = (1 - R_Schw / r) c^2 dt^2 - 1 / (1 - R_Schw / r) dr^2, where R_Schw is the radius of the event horizon. Notice that at the event horizon r = R_Schw and the dr^2 term diverges. The distant observer therefore concludes that there is a singularity at the event horizon. This analysis lead physicists to initially conclude that black holes were unphysical.

A more careful analysis reveals that this isn't the case, however. We have been using this metric which describes the shape of spacetime according to a distant observer. But what we're really concerned with is not what a distant observer calculates, but how a local observer perceives spacetime. If we now switch to a coordinate system in which we are free falling into the black hole along with the beam of light, we find that nothing remarkable happens when we cross the event horizon. The light is blueshifted relative to its initial energy, but it doesn't have an infinite amount of energy. Thus there is no true singularity at the event horizon. This singularity that the distant observer found must therefore have been an artifact of the particular coordinate system that the distant observer was using. The free falling observer can then hold up a mirror and send off a light beam and have it return back to him even after they have crossed the event horizon.
So the root cause of this is similar to that of the broken Bumbeebee upgrade script [1,2]: a typo (missing quotation marks or unintended space) caused far more data than intended (a whole volume or /usr) to be rm'd.

1: https://news.ycombinator.com/item?id=2661209
2: https://github.com/MrMEEE/bumblebee-Old-and-abbandoned/commi...
I think, even if light beam trajectories were reversible (to which I cannot answer) in normal space, the singularity breaks the rules of the normal space.
Disappearing Darkness: Places to enjoy the night sky are few and far between
Although giving, for example, Bill Gates $100000 is redundant. That's pocket change for him.

Edit: although I see now that Snowden has been made honorary recipient. Not sure why he wouldn't need the money though.
Ratio of query time vs insert time?
The answer is: don't get sick in the U.S.

Breaking Bad is accurate in terms of what happens when you're sick in this country. (I don't know of any who became meth kingpins, but people doing stupid stuff due to medical-cost desperation is common.) Health insurance won't cover everything. It won't cover most things it's supposed to cover. Its purpose is to collect premiums when you are young and healthy but when you are sick or old it has no interest in serving you. You're just a problem customer in their portfolio.

Also, if you get seriously ill in the U.S., the payment/insurance aspect of it (and all the compromises you have to make to avoid unreasonable costs) will often add PTSD into the recovery process. I know people who have been essentially broken by the financial fallout (and the emotional drama around abandonment or, if they landed in debt, being pursued) of a serious illness. This is common, but few talk about it.
>Bear in mind that systemd is being integrated with the Linux kernel, so you have to update the kernel in sync with systemd.

Do you have a source for this or is it FUD?
This would have been great, but the lack of a 1-to-1 mapping between data models complicated this. To migrate a single "record" required several queries in the old database, some restructuring, and then several inserts into the new database. We were restructuring nested records in mongo into several separate relations in Postgres.
I disagree with both your conclusion and how you state it. You should put forth a logical argument that supports your position instead of asking a question that presupposes your conclusion.
This paper claims that black holes can't come into existence, which is subtly different from claiming that they cannot exist. In particular, black holes can exist as long as they've always existed – it's just that new ones can't come into existence. Maybe the universe just has a fixed number of singularities. [I am not a physicist – this just struck me as an inaccurate implication in the article.]
Because I hate the negativity.
I have been diagnosed with chronic pain syndrome, a related or possibly the same disease (there's little science to go on for either condition). THC is fine and good and generally more useful than opioids, but it's no panacea. It just takes the edge off more than anything.
Ok. To start she addresses only "Gravitationally Collapsing Star"s. Interesting result, may be many star lifecycles don't end in a black hole. The "before-black-hole" state she describes still would involve significant time dilation and thus what we see as Hawking radiation from black hole may just be Hawking radiation from "before-black-hole" star. Looks the same :)

The result doesn't say that black hole is impossible. It says that a star's collapse loses mass faster than acceptable for the collapse to end in black hole.

Some misconceptions in the web-post:

>They are the ultimate unknown – the blackest and most dense objects in the universe that do not even let light escape.

a black hole isn't necessary most dense. After all a black hole with a mass of visible Universe would be only 125 times denser than current average density of the visible Universe (i.e. 45B light years radius of visible Universe have 10B light years Schwarzschild radius)

> So the story went, an invisible membrane known as the event horizon surrounds the singularity and crossing this horizon means that you could never cross back. It’s the point where a black hole’s gravitational pull is so strong that nothing can escape it.

"membrane" is very bad illustration. It is constantly changing solution to the gravitational equations. One moment it is here, another moment - it has moved because gravitation of black hole changes and a lot of oscillations/perturbations happen. One moment you're inside, another - outside.

"gravitational pull is so strong that nothing can escape it" - that's bad wording too. It is actually "gravitational well is so deep that nothing can escape it". Feel the difference :) A huge black hole may have pretty weak gravitation at its horizon.

Thus no-escape is valid only in the sense that escaping object just would never reach "a point at infinity" from the black hole and the light would get red-shifted into full oblivion.
Invertible Bloom Lookup Table Implementation in C++
hstore isn't really as flexible as a Mongo document, given that both keys and values must be strings, and you can't query into a document nested inside an hstore value.

Now, with the jsonb support coming in 9.4, PG gets pretty much everything I once liked Mongo for.

http://www.postgresql.org/message-id/E1WRpmB-0002et-MT@gemul...
I posted some casual, but in depth notes on my site for anyone wanting to skip the video:

http://chriskvamme.com/
Since January I've been insisting that we make atomic commits, but now I'm looking to switching to squashing them into one before merging. This makes it a lot easier to roll back a whole feature and not half way through it.

Plus, our graphs look ridiculous, I'm easily 5-10 times over the others, but it's not that I'm doing more work, I just commit more often.
Facebook blocked our url and there's nothing we can do?
Site is completely harmless.. I don't get it?

URL: http://www.freesociety.com
This is the first question I thought of. I'm not a physicist so I dare say I can't interpret the paper but I'm curious how she explains the seemingly observed orbits of stars around the black hole in the middle of our galaxy and others[1][2].

[1]http://astro.uchicago.edu/cosmus/projects/UCLA_GCG/
[2]http://en.wikipedia.org/wiki/Accretion_disc
> Do people really just "submit to arxiv" and then that it?

Some people do: http://en.wikipedia.org/wiki/Grigori_Perelman
I sorted things out yesterday, but one thing I do have to note - every time I have called customer service (which I've had to do a number of times, because emails are never answered), whenever I am promised a callback, it never happens. Same thing again yesterday.
I'm not at all acquainted with astrophysics but I remember seeing an article state that there was a different physicist who proved this same thing:

https://news.ycombinator.com/item?id=7191324

A quick google shows his response to this:

https://twitter.com/abhasmitra/status/514804101024997376

His response:

"Hawking radiation is unproven. And particle physicists are not aware that even without any Quantum Mechanics, classical gravitation dictates that all gravitational collapse must be accompanied by radiation. :

http://link.aps.org/doi/10.1103/PhysRevD.74.024010

(http://arxiv.org/pdf/gr-qc/0605066v3.pdf)

And then grav collapse should naturally lead to radiation supported ECO:
http://www.sciencedirect.com/science/article/pii/S1384107606...

http://mnras.oxfordjournals.org/content/369/1/492

http://mnrasl.oxfordjournals.org/content/404/1/L50

And as far as non -formation of ``Event Horizon'' is concerned, in contrast to the conjectures of the present yet unpublished paper I gave EXACT proof:

http://www.ias.ac.in/pramana/v73/p615/fulltext.pdf

But phys.org never highlighted my research which is infinitely more accurate than the
present paper whose authors are not even aware that Question of Hawking Radiation
Would Arise Only If There Would Already Be a Black Hole With an Event Horizon. Therefore
This paper is not self-consistent. But that does not matter:

The lead author of this paper has CAMBRIDGE AFFILIATION.

So phys.org is glad to highlight an inconsistent and yet unpublished paper by ignoring my series of my exact and original papers on the same topic."

I don't have any background in astrophysics, can anyone comment on Dr. Mitra's response and the relation of his work to the above research?

The best discussion I can find on Dr. Mitra's work is on quora: https://www.quora.com/Is-it-true-that-Abhas-Mitra-resolved-t...
Very cool SDK Jakub, congrats! Lots of possibilities.

What is the coverage area of 1 beacons? If I want to map a big hall, how far should each beacon be placed one from another?
Show HN: Doc.pm – adds your message to the links you share