skysight-inc/HackerNews huggingface dataset:
The top of the wheel is moving faster than the train. If the contact point between the wheel and rail is not slipping, the relative velocity between the wheel at that point and the rail is 0.

To maintain that condition, the top of the wheel has to travel at twice the speed of the train. Imagine a point on the wheel. Each time the train moves ones circumference forward, that point also makes a circular trip of 1 circumference.

So at the top, when the motion of the point relative to the train is full forward, the net velocity is twice the train. At the bottom, when the motion of the point relative to the train is full backward, the net velocity is 0.

There are diagrams and further explanation here: http://physics.stackexchange.com/questions/48234/why-is-the-...
JavaScript is the best first programming language to learn
Never heard of SelfControlApp but looking at it, it might be just what I need since I just started working remote a few months ago. Thanks for the link!
In support of your hijacking: no, you're not. I find it annoying. It has the stink of "we've got to do something different but we don't know what...let's mess with something that isn't broken!"

As abhorrent as I find John Deere's anti-ownership approach, I say let them continue down that road. It will provide another entrepreneur the opportunity to create and sell a more easily maintainable, you-bought-it-so-you-own-it alternative.

God knows the home appliance space needs that kind of alternative.
Do you have any source material for the effects of air travel on climate?
What, Exactly, Do You Want?
1. Working on it :). I'd appreciate feedback on the scope of an mvp feature here: e.g., daily/hourly/5 minute-ly periodicity? Scheduled day/time in the future for a one-off? Or is anything short of full cron not enough?

2. Yep. Initially, you'll have to include the Clojure runtime as a library in your ZIP file, so it will look to Lambda like a Java function. Then assuming there's interest, we'll promote it to a first-class experience in the console and API as a language of its own at a later date.
I'm not sure if this stuff can be interpreted like EX-YU breakup wars were not about land (and which Ethnicity/Religion/Language/etc lives on it)... Or these guys should reconsider why neither Serbia nor Croatia want that part of land... Or ...
Here's a great example. A mobile friendly page for the Harmony of the Gospels. It's supposed to be a simple chart: four columns, one for each book, then you look at the rows to see if a particular part of the story is present in a book. The mobile friendly site stack the columns linearly down the page -- totally useless, but I guess it will rank higher now.

https://www.lds.org/scriptures/harmony
Most underlying implementations won't actually dereference here (which is why it usually works), but as far as the spec is concerned, you are dereferencing it, which is undefined.

That becomes a problem with modern optimizing compilers, because they make assumptions about your code based on what's allowed according to the spec.
Considering that Death Cab For Cutie isn't even that good, I would have been disappointed either way.
Building a Blog? Make It Mobile Friendly
If a stupid law disproportionately harms black people, that's racist.
Depends on what you mean by success. If you mean being a profitable bootstrapped business there are probably tons of companies. Companies that went on raise series A and beyond some companies might be out there.

However I have feeling success for YC is having a company become a Unicorn. The question to ask is which startups that didn't get into YC are now Unicorns.
If Deere and GM prevail, then we need to change the laws to recognize that these vehicles aren't being purchased, but leased. There are accounting and tax implications for the lessor and the lessee that need to be resolved.
I recently attended a parents' meeting for the elementary school science fair. If the 5th-grade students were doing an experiment that involved animals, they had to fill out a stack of forms and collect the signature of a vet. If the experiment involved humans--even if that involvement was as simple as answering a question--each human participant had to sign a form.

My kid, who also attended, said, "I'm doing my experiment on plants."

Elementary school science fair! If you want to condition your own dog to salivate at the sound of a bell, you need to fill out additional paperwork and get your vet to approve. I can only imagine what load of crap university scientists have to wade through to get any research done.
you have a strange definition of immutable. Language is changing rather constantly. Take an 80 year old and have them listen to a conversation between 16 year olds. I bet there are a bunch of words they don't know the meaning of.
Thanks (and love the suggestion of R, though we probably want a repl as well for that).
The ADA is indeed retroactive if the modifications would not pose an undue burden on an establishment's business. In this case, I assure you that the undue burden clause does not apply. There is also a difference between negotiating in good faith and negotiating at the barrel of a lawyer, which is what these guys did. There is also a precedent in these kinds of negotiations, as I myself am experiencing in another issue that may ultimately need to go to court, where "negotiations" often involve making vague promises that are never fulfilled in order to keep you hoping that one day a business will comply. Sometimes you just have to show up with a bigger stick to get folks moving.

The "jerks filing disability lawsuits" trope is one that the media likes to trot out for a good story, and which should really go away. The ADA in states other than, I think it's California, only allows you to sue for compliance, not for additional damages. I'm not saying that you're claiming this, but it isn't easy or rewarding to bring one of these lawsuits because all you can hope for after hours of work is to be able to use a bathroom somewhere you couldn't before. My GF was indeed subpoenaed, and was reduced to tears just because she wanted an accessible table and bathroom at her doctor's office. The "take your business elsewhere" argument is also a tough one to uphold when a) even hospitals have inaccessible bathrooms in their own rooms, so there's no guarantee that you'll find an accessible business on your next time out and b) you've already forged a relationship with a doctor who understands your needs. FTR, she had already taken her business elsewhere several times that year by virtue of needing tests done at other facilities, and in addition to the same "no accessible tables" argument she was almost dropped by staff who refused to listen to her and who insisted on doing things their own way. Being able to take your business elsewhere and having a better outcome is a point of able-bodied privilege.
I really don't think so. You might just be underestimating the number of static asset files in a client-heavy web app before concat/minify ever happens. Watching the logs, you could see... each... little... file... take... way too long.
Windows 10 release date this July
Show HN: Emacs Theme Creator
I don't think many people find HN from Google search!

https://www.google.com/webmasters/tools/mobile-friendly/

Test your site with the above link.
It is fascinating. Something I wonder is why nobody thinks that "sky disk" is a bronze age buckler.
Recalling public middle school in Wisconsin:

>Walk (or cycle) to school: 10 minutes

School starts at 7:40a; most days walking between 7:15a and 7:30a; for most of the year that walk is in the dark or the sun is very low and not very bright.

>Morning break: 20 minutes

Never got one of those

>Lunch: 45-60 minutes

Try 20.

>Afternoon break: 20 minutes

Never got one of those

>Walk home from school: 10 minutes.

Figure one extra-curricular with a duration of 1 hour. For most of the year, the walk home for me was 4:00p-4:15p which was entirely dark.
That's right. Check out our features page for details on the driver apps and the other facets of the product: https://onfleet.com/features
Then run Mac in a VM on Linux.

IntelliJ, Git, and music-listening developr here. On GNU/Linux.

It does not make sense because you stop yourself from knowin the inner workings of what you are targeting in your development efforts - eat your own poison so to say - CentOS - run CentOS. How hard can that be?
A back-to-front TrueCrypt recovery story: The plaintext is the ciphertext
Looks like a real humdinger of a product! And saves energy too!
I thought they were going to do the pickup/delivery for me. Is there a service that does that? Why not?
Learning javascript is important nowadays, given its popularity... but as a first language? No... it's not a good idea, whoever learns javascript as a first language will learn a lot of bad practices along the way...
As a guy who has been packaging software for both, and who has been using Debian daily for years, RPM SPEC files are a hell of a lot easier to understand than the Debian packaging system (on the other hand, they're not really machine-readable or easy to generate automatically, so you have to choose your headache).
It's perfectly possible for many families. But for others it is not so safe and easy, while many others probably just won't do it even if you exhort them to.

(The answer is 'someone who can't edit his comment after the timeout'. But I suppose it can be my daily blow struck for social justice.)
Google decided a while ago that user search behavior on tablet is more similar to desktop than mobile...that's why in AdWords mobile is a separate bid modifier but your desktop targeting cannot be seperated from tablet.
2. Most languages have a way to store raw arrays that can be passed directly to the numerical routines. If you have to marshal, then it depends on the problem size and amount of work done in the numerical routine.

3. Yes.

4. NVIDIA has a track record of misleading comparisons. They cleaned up their act in the these CUDA-7 benchmarks: http://devblogs.nvidia.com/parallelforall/cuda-7-release-can... in response to this G+ discussion https://plus.google.com/+JeffHammondScience/posts/G1MzHqZaxy... .
Thanks to Szilárd Páll for calling attention to this discussion and to Mark Harris for updating the plots. Note that this should not be interpreted as "MKL/Xeon is catching up" but rather that performance comparisons are sensitive to the details of the experiment and it can be hard to recognize the consequences of biased configurations. Better normalization and standards for comparison can help.
If you want to go deeper into the rabbit hole, try Foucault's Pendulum, also by Eco.
This is boring, these guys are talking about software that existed (briefly) between the 80s-90s before the open source era. All this make the necessity of a stronger open source hardware.
At least the automakers should let you replace their SW stack with an open source alternative.
>Now all of a sudden you're administrating a pool of VMs with different OSes, writing web-scrapers, launching web servers every test cycle, waiting for tests of pages you haven't changed, running n tests * m pages * o server configurations * p clients, and all of a sudden you're spending more time keeping your tests working, or changing your software so tests run faster, and you're hardly spending any time working on features users want.

You're right - it eats a lot of time and it shouldn't. It's not as easy as unit testing and it should be.

I actually wrote an open source testing framework to handle this type of thing precisely because I was getting so frustrated with having to rebuild the boilerplate code to do this everywhere I went.

This is a simple example test I made with it - it uses a browser (w. selenium), libfaketime, and a mock SMTP server to test a django/celery/postgres/redis app:

https://github.com/crdoconnor/django-remindme/blob/tests/tes...

And this is the harness - it runs 5 services and a browser in 50 lines of code:

https://github.com/crdoconnor/django-remindme/blob/tests/tes...

The framework is currently in pre-alpha now, but it should be a bit more stable in a few weeks. It should be usable to test virtually any kind of software that runs on UNIX, also (not just python apps).

Easily handling the "m pages * o server configurations * p clients" problem is on the roadmap. Different browsers and server configurations will be treated as "just another kind of fixture", and it will be easy to feed fixture groups so that you can run the same automated test under multiple scenarios.
> John Deere may be out of touch, but it’s not alone. Other corporations, including trade groups representing nearly every major automaker, made the same case to the Copyright Office again and again.

In Capitalism, the game is to make monetary profit & control the market, above all else. It makes sense what John Deere is doing. They are just being good Capitalists.
Do You Need Master Data Management?
You Don’t Need a Perfect Tech Ecosystem, but You Need Many Parts to Be Excellent
Huh. So, like an iPhone, you don't get to see or modify the software on a tractor. What's new about that? Its the same with my desktop computer, come to think of it.
I find the simplicity of HN a real plus on mobile. It's much easier to read on my iPhone than many 'mobile friendly' websites.
It only affects users on Mobile. So 'mobile searches'
Meh, they said the same thing about pagespeed and it was meaningless.

It's against Google's nature to purposefully diminish their search results' relevance, ergo $$$ and engagement.
Swing like you're on the Web
Building world’s first realtime and collaborative HTML editor
Can I ask why not? A well behaved dog -- which by definition a guide dog is -- is generally cleaner and better behaved than many humans.

To be honest if I was running a taxi service I would prefer well trained dogs to humans.
Uber is lying of course. Those figures are revenue. Subtract operating expenses of around 50 cents per mile and then you have real earnings or "wages."
Right but the issue with that approach is that the better alternative rarely appears. Your own example of the home appliance shows that.
Where can I find examples of complete AngularJS apps?
The people who have the money to buy the mega-tractors you see in the article don't care. That's why, unless someone outside the industry makes a stink, nothing will happen.

These are giga-corporations who are 'family owned' in name only. If they don't rent, they operate that machine for a few years, play the tax game, and trade it even-money for a new one. To them, ownership doesn't matter. Their service contracts with implement dealers let them not worry about who owns what. All they care about is whether or not it works.

(Off topic now) Between this and the stupidly high price for land, it's small farmers who are getting left in the dust. I say this in every thread related to farming; I am in my early 30's and I guarantee I live to see the death of the actual family farm.
Is wage calculated without costs like loan repayments on the car, gas, etc.?
Amsterdam Schiphol is like this, too, and yeah, it's great. I think for them it's because they're going for this combination airport/mall/mini-city vibe, and there are enough amenities that they want it to be attractive as a destination, even for people not flying, so they want to keep as much of the airport outside of security as possible.
The Postmates API could probably help with that ;)
I'm not in a city, but where I live, if you want to dump large items, you have to take them to a dump site yourself, and pay a fee. Some towns around here will take limited large items from your curb free, but only on specified days, usually around once a month.
I have been rejected each and every time I have applied, and have submitted with various ideas/projects. However, the most recent project is patent-pending software that allows drivers to hire ticket defense law firms without the need for human involvement. The proverbial...Rocket Lawyer for Ticket Defense.

Our software has been live since September with a Florida Ticket Defense Firm we have seen great traction and growth (400 clients in the last 90 days), and we appear to be on schedule to offer our software to law firms nationwide starting next month. I am not sure to date this could be defined as a success in the YC sense, we have had no funding, we have had no media coverage, no VCs on the board...but there has been local market adoption of our product and the potential to scale this seems attainable even if boot-strapping.

Edit: To be clear I am not saying YC defines success as funding, or media coverage...but show me a YC company that has achieved anyones definition of success without getting Funding and media coverage as a step along the way.
> Wikipedia is one of the best examples of a site where I prefer the desktop page on mobile.

I actually have the opposite opinion, that the mobile wikipedia version is much better-designed and intuitive. I prefer the mobile version on desktop.
And why would we be interested in your use cases?
Containers: Fundamental to the cloud's evolution
Bir Tawil – Terra Nullius
" mobile-friendly typically disables zoom"

That's just a stupid choice made by (so many) web developers. I checked a sampling of my own sites with Google's tool and they all passed as mobile friendly, but none of them disable zooming. (HN fails, of course.)
The company argues that allowing people to alter the software—even for the purpose of repair—would “make it possible for pirates, third-party developers, and less innovative competitors to free-ride off the creativity, unique expression and ingenuity of vehicle software.”

Next step: weld the hood shut so competitors can't see the parts.
One possibility would be for drivers to negotiate with Uber to provide some kind of insurance to cover cleaning costs and downtime for specified incidents, similar to how AirBnB provides insurance to cover if a guest tears up your apartment. Whatever the solution is, this is a cost of doing business that should be borne by the business, not by disabled people and other members of the general public.
No, it isn't. Racism has to include a positive correlation with race. And not a correlation with a confounding variable. In this case, the rate of offending is the confounding variable.
Come to think of it, linux and gnu don't come from the US.

So isn't open source bad for the US economy ?
Now that's what I call selling pickaxes!
It's not just mega-tractors that are software-controlled these days. It's all tractors. Including those used by "small family farms".
I find it odd that a majority of the articles and documentation about React Native fail to mention upfront that Android development isn't available yet. While this article does mention that fact, it seems weird to me to push a cross-platform solution when only one platform is available.
This hangs and hogs the CPU on "Starting Docker VM" for me.
Beware, auto-playing video. Dear webdesigners, fucking stop that crap. Not everyone lives on an unmetered connection, and videos suck bandwidth like nothing else!
Thanks, this was informative :)
Definitely; I agree with you on the demographic trends, but for the moment it's still pretty much the same chinatown as always IMO -- definitely not gentrifying in the way the mission is. Yet.
Articles like this always push me towards the Stallman way of thinking that all software should be open source and everyone should have the right to modify/fix/change the software in any way they see fit as long as they aren't trying to resell it as their own work. It's a tough subject, I make an extraordinarily good living from writing closed source software but I constantly feel as though I should support open source software more.
It's probably a domestic vs. international thing (where "domestic," within Europe, probably includes actual-domestic as well as other destinations inside the Schengen area). To a large degree, US requirements have infected international travel around the world -- you can't fly into the US from a terminal that allowed people that weren't held to approximately the US's standards.
China curbed the flood of money going into real estate, trying to prevent that market from over-heating and crashing (which has led to a falling real estate market).

That money has redirected into equities. China saw three million new stock trading accounts opened in just the first two weeks of April.

China has been flooding their economy with truly massive sums of liquidity and debt the last five years. It will continue to redirect into available assets until it gets destroyed in a crash (which will be in the form of a huge stock market crash, soon).

This is end of the line for China's boom phase. They're almost perfectly repeating what Japan went through as their growth boom came to a halt, including the mistakes (extreme debt, asset bubbles in real estate and stocks, etc), and other signals such as demographic decline and 'deflation.'
They're also a great fucking company. Nerds care about this sort of bullshit. People who turn seeds into fruit into dollars care that the manufacturer will drop in with a helicopter to a field and get you going fast with a loaner part the size of your entire cubicle.

They also have interesting jobs available on their test farm for software engineers.
That's exactly what happens though.

I only made the point implicitly, but you have no idea if this is the case or not. Nor do the moderators, even though they have much greater visibility into the voting dynamics. Nor do I. Because I can say I voted for whatever reason I want, even if I really only downvote comments that contain a capital "V".

I don't particularly see a hive mind here (but maybe I'm too much a part of it), the majority of the comments that get presented as brave iconoclastic free thinking aren't really.
I have a huge aversion to mobile sites. It's like consuming the Internet through a straw. I want to be able to zoom out and see the overall structure of the page with a pinch of my fingers! My eyes and screens have retina resolution, so I don't mind small fonts. The worst is when you have to scroll all the way down to find the link to the desktop version, or when the site depends on the device-width in the viewport meta tag so that the "request desktop version" function has no effect on iOS. Sigh.
Maybe it's a tech-fetish.
The Germans tried the same thing with Transrapid for many years (between Hamburg and Berlin), but just ended up upgrading conventional rail.
Cheaper than Tasmania for most things except rent.
http://www.quickmeme.com/img/26/2649625d2abe63c7d66c958aa9c4...
Great point.

Those jobs will be gone soon anyways. Uber wants nothing more than to replace human drivers with AI.
Almost always bookmarking.
Imagine NYC to Boston in 40 minutes and the kind of boost it can bring to the innovative power in the region. It will be truly a silicon alley. And imagine two innovative centers in the country competing with each other.

Unfortunately this kind of decisions are not made by innovative people.
Well that's fine. You license me the tractor for $X per month and let me cancel that license and return it on a reasonable period of notice, and you have a deal. If you're going to license things, you can sell licenses, but if you're going to sell an object, I own the object.
Yes, we are discussing putting a maglev from St. Louis to Boise, Idaho because someone wanted to show you why it wouldn't work in the U.S. I bet if we thought about it for another second, we'd come up with more suitable places.

Los Angeles to San Francisco 400 miles

Los Angeles to San Diego 150 miles

NYC to Philadelphia 92 miles

NYC to Boston 220 miles

NYC to Washington DC 226 miles

Chicago to St Louis 260 miles

Dallas to Houston 240 miles

Dallas to Austin 200 miles

Austin to Houston 170 miles

Tampa to Orlando 85 miles

Miami to Orlando 235 miles