skysight-inc/HackerNews huggingface dataset:
I have a friend who commuted via high-speed rail from Berlin to Braunschweig, logging on via the rail WiFi to start work. He'd arrive in a little over 2 hours, work for ~4 hours, and head back home finishing his work day on the train. It's a long day on the train but he loved it and continues living in Berlin today.
Maybe there was a secondary thruster somewhere to provide some separation.

I went back and recorded the release speed (km/hr), altitude (km) for each drop:

25960 626

25954 627

25950 628

25944 630

25937 632

25935 632

A circular orbit at that height is about 29000 km around; 25 km/hour of difference between release 1 and 6 would give them a separation of 6 degrees longitude/day, or ~50 days until the faster satellites 'lap' the slowest one.

Not any sort of rocket scientist, but I gather the strategy with these kind of LEO satellites is to just throw a pile of them up there semi-randomly, and count on at least one being in the neighborhood when you want to talk to it.

edit:
Last paragraph is wrong. See my comment two levels down for the answer.
I love the bullshit excuses people make for sticking around on social media.
I had to stay late at work to finish last tasks before my vacation time; I was worried I'll miss it, but I managed to tune in just few minutes before the landing. I have a huge grin on my face that won't go off easily. I've been waiting for this moment for a long time, and I'm going to be an insufferable person tomorrow, yelling to everyone in the earshot about it!

EDIT: To quote my friend's reaction,

"HAPPY FEET, WOMBO COMBO!

Let's Kerbal the shit out of Space."
Short video of just the landing: https://www.youtube.com/watch?v=1B6oiLNyKKI

(Becomes clear 25~ seconds in)
It’s true that error handling in pure computations tends to be easier than the general case.

A lot of the more tricky situations to deal with, IME, tend to be when you have acquired some resource but then for some unexpected reason the resource stops co-operating. Some of the most awkward problems then happen when you can’t even clean up properly at that point, for example by deleting a temporary file or committing a pending transaction on a database, because of the failure, and so you wind up with some externally observable side effects of your program that can’t be fixed.

Another awkward area is running out of system resources such as memory or processes/threads, which many high level programming languages aren’t well equipped to handle gracefully. Lazy languages like Haskell are relatively vulnerable to thunks building up and consuming excessive resources, for example, and while there are practical tools for mitigating that problem up to a point, a lot of the neat theoretical models pretty much go out of the window if you really do hit a hard limit in a production system.

That all said, carrying error information within a monadic framework would be another good example of the kind of systematic error handling strategy I was talking about before.
Did you try swiping left/right? That definitely works for me.

Unlike you, I actually found this refreshingly nice, especially considering it's a government site. Usually you get one broken experience, this has lots of options which all work well (albeit some not fitting well for all styles of consumption, but still well implemented otherwise).
I think you misunderstand what money is in a more real sense. It is a tool we use in our lives. I think parent describing the scenarios is making good a explanation if you leave the premise that all debt is necessarily bad.
so 0-60 is 10 seconds? I blame space/astronaut movies.
If they actually manage to raise this amount of money then an amazing amount of capital is going to be destroyed over the next couple of years. Uber and Lyft going head to head to try and grab a monopoly is an extremely effective way for investors to lose a truck load of money.
2015 SANS Holiday Hack Challenge
When the real interest rate is high, business retained earnings are more valuable. Thus, economic power is transferred from lending institutions to profitable corporations. Who do you think does a better job investing?
Really, 'classless'? The achievement is landing a space-capable booster vertically, after an actual mission above 100km, which can then be reused. And, Blue Origin managed that first, no two ways about it. I think it's probably pretty classless to imply that what Blue Origin managed to do was 'trivial'. Just because SpaceX is the current hacker's favourite, doesn't mean you have to downplay everyone else. I think Musk's tweet about the difference between 'space' and 'orbit' was actually pretty pointless hair-splitting. Now, you can get technical and say that the achievement is landing a booster that is part of an orbital launch system but really, what the rest of the system does has no real part to play in the landing of the rocket stage, and I think everyone else understands that.
After searching around, it looks about average for a large data center. This link[1] estimates Google's data centers require between 50-100MW.

50MW is enough power to supply ~14k homes from different references I've seen.

I'm curious about what normal data centers use for backup power since natural gas and diesel generators don't get much bigger than 2MW. Or maybe they just don't have backup generators.

[1] http://www.datacenterknowledge.com/google-data-center-faq-pa...
Why is this the master algorithm?
Pedro Domingos just wrote a whole book talking about potential master algorithms and how finding one is the ultimate goal of AI research. The title of the article just seems to be lazily using the term.
This is only a measure of "social media popularity of national offices of either head of state, head of government, or government as a whole" (with respect to national education levels) according to the original report. [1] The report also classifies the social media strategies of various OECD countries, but does not list Germany's. [2, right side] Perhaps the Chancellor's office has other priorities.

[1] http://www.keepeek.com/Digital-Asset-Management/oecd/governa...

[2] http://www.keepeek.com/Digital-Asset-Management/oecd/governa...
The satellites themselves usually have small thrusters but I'm not sure what kind of orbital change the can effect, usually they are there for detailed maneuvering and to boost the satellite to a slightly higher orbit as it decays. When it runs out of fuel it dies so you'd try to use as little of that as possible during launch.
I guess what I was going for was more of an option rather than a requirement. For instance, if a person who has been vetted by a professional and doesn't have an issue, they could do this instead of the interlock. The hope is that rather than helping one person not drink and drive, it would help many people not drink and drive. I agree that it sounds expensive. I am hoping to figure out other ways to receive funding.
the irony is that in order to satisfy these 'negative time preferences', inflation forces people into risky investment behavior, which is basically regressive wealth redistribution. And then we complain how the rich get richer and the poor get poorer, and blame it on capitalism.
Good enough for me. Even if it is only 25% in practice they'll own the market.
SN Refsdal: The First Predicted Supernova Image
Only by as much as the miners themselves spend. And it's a running cost, you have to spend it every day, while an attacker would spend it only during their attack.

The only way to make a 51% attack impractically expensive is to make the network impractically expensive to run.
Afair Computer History Museum has an interview with one of IBMers that was present at this meeting.
The shuttle's main engines were extremely high-performance. They were marvels of engineering but required a lot of work between flights. Just like cars can be optimized for performance or reliability (think Honda Civic versus Ferrari) rocket engines can be made more maintainable and tolerant to long use periods. Not saying Spacex engines are Hondas, but they are probably way less trouble than SSMEs.
Whole OSes were written in Lisp, too, as well as other GC'd programming languages (Smalltalk, Mesa, perhaps a few others), and they ran on rather underpowered hardware by modern standards as well.

I get your point, but having to check for allocation failure is a substantial source of bugs in non-trivial programming without GC, and having to manually allocate RAM makes string handling, for example, orders of magnitude less safe than it is in a language with GC.
GPL enforcement is a social good
Earlier today Tim Urban mentioned in his post that there were a few dry runs, even including high-fives.
Cutting rates would not necessarily stimulate investment: http://www.themoneyillusion.com/?p=31372
I'm educated, but I'd way rather see what my friends are up to or what their kids are doing than try to "understand the world" (whatever that means). Facebook is great for that.
This paper was published in 1993, and not 1998, as the HN title currently says.

You may wish to read the excellent Wired article from 2008 about the somewhat eccentric author of this paper, Piotr Woźniak.

http://www.wired.com/2008/04/ff-wozniak/
That makes more sense. Juniper lied about older firmwares being backdoored to force old customers into fresh support contracts. Not as fishy, just more Oracle.
I actually think it is a fantastic idea, but a mediocre implementation.
This is more an example of Gresham's law than anything else.
As does the public that might decide to host a bunch of stuff with AWS (or not). Really bad move on Bezos' part, not everything is economics.
Ask HN: What would your dream web framework look like?
I intend to write a web framework that brings together the best ideas from server-side and client-side frameworks.

I am biased toward Django/Ember, so a lot of my ideas come from there. But I know some Rails as well as some Angular, Backbone, and Knockout.

My ideas:

0) Isomorphism via a CoffeeScript-like language that compiles to JS and Python, or a full-stack Node framework written in a CoffeeScript-like language.

1) Folders for server, client, and shared code. And maybe more folders to build a Replicant/Android client with something akin to NativeScript.

2) Support server-side rendering for faster loading in the browser (a la Ember FastBoot).

3) A Model which contains the definitive representation of real-world objects. DB interaction, validations, forms, serializers, etc. all derive as much as possible from the model. Model "classes" have field instances which, in one place, define how they fit in the database and what developers/end-users can do with them. Inspired by Django and, to a lesser extent, Ember.

4) Don't Don't Repeat Repeat Yourself Yourself. See 0, 1, and 3.

5) Real-time with no need for more than one or two lines of code to opt in and make it work. New, updated, or deleted models publish automatically, notifying something like a Django class-based view, which pushes the new data to all clients subscribed to that view.

6) Declarative templates like Ember. But even a basic operation, such as updating a template when an attribute in the model changes, has a default (replace part of the template to reflect the new data) which can be overridden easily to get animated updates, without jumping through hoops and/or accessing private APIs.

7) First-class support for indented languages such as Emblem, Sass, and CoffeeScript (or a similar language).

8) Free as in Freedom. Preferably AGPL, but LGPL or Apache--with its explicit patent grant--could work if a more permissive license is needed to promote adoption.

Your ideas?
Glad you clarified your position. So, it boils down to the use of the domain in isolation. There's a type of humor that covers that depending on his intent (& only with that intent). I can't recall the name but it's contrarian, controversial, and a bit trollish. The idea is you pick a taboo word or activity to use in a way that causes no harm. Then, people rally against you over it. Then you laugh at them for their wasting time on it.

Alternatively, a form of this draws attention to how much true evil society tolerates under banner of "acceptable behavior" while they put energy into calling out harmless domain names that should get an eye roll at someone's stupidity at worst. These domain names probably received far more hate from certain people than any carcinogen-filled product or even laws that re-enforce things that hold blacks back. Some get virtually no complaints but taboos almost always do. Ya think? ;)

Note: I don't like the domain name(s) for the record. However, I think it can be a joke or a tool of activism in certain situations. I don't know if contrarian, taboo-oriented humor or calling out people's BS was the goal here.

Note 2: I forgot to add I'm big on the second paragraph's version of this kind of humor. I call out self-righteous pricks all the time with it. Includes use of "the N word" in the positive ways blacks use it. It's just too effective at finding most judgmental & often (not always) hypocritical folks. :)
Noticed highjacked scrollbar; closed tab immediately.

(Then came back to HN to whine about it, of course.)
>A hydrazine propulsion system is installed on the spacecraft for orbit adjustment maneuvers and orbit maintenance providing a delta-v budget of more than 100 meters per second for each satellite.

>Because OG2 satellites are launched in groups of several spacecraft, they require propulsion systems to place the satellite into different nodal planes to begin operations.

There's the answer, courtesy Orbcomm.
It's absolutely insane how loud the rockets are. Spend about 15 minutes of your time and just search YouTube for test firings - you won't regret it.
Rural life is amazing. That 30 second commute from my bed to my desk is the only way I can work 12 hours a day and still have time to walk the dog, tend the garden, and enjoy the outdoors, and avoid having to engage with the seething squalid mass of humanity unless I choose.

Remote work is the best. Having to get all your employees breathing the same oxygen will hopefully seem like an insane anachronism in fifty years.
This is like the idea of storing the code in a richer file format rather than just text. It would be up to the editor to format it and present it appropriately. This would also allow for code comments, pre-post checks, assertions, and other metadata to be embedded into the code without having to be typed in some meta language or language extensions in the plain text.

I would like to experiment with something like that but given how much existing plain text code there is I don't see this happening any time soon.
I think you underestimate the degree of difficulty between these two achievements. They are both very impressive but what SpaceX just did is many times more difficult than what Blue Origin did.
I think his remark was an ugly bit of ego, but I care about any endeavor to develop space travel technology.
New Shepard is able to make several compromises that make landing _much_ easier. New Shepard doesn't have to get anywhere close to orbital velocity, so it can use a far less powerful engine. That means it can throttle down far enough to hover. That is a _huge_ advantage over Falcon 9, which must time the landing burn perfectly to hit 0 velocity at the exact moment it touches the ground.

They're in the same club like a general aviation pilot landing his Piper Cub on a giant runway and a navy pilot landing his F-14 on a carrier are "in the same club". While it's technically true, pointing it out would be pretty tacky...
Neat :) So they do their own placement. Nasty stuff, hydrazine. F16's use it as emergency fuel.
Presidential Candidates Must Articulate Decisive Cybersecurity Plans
I can't find the study I was thinking of which involved the extreme disparity between the sender's self rating for their ability to convey an intent and the receiver's impression.

Here is a similar abstract:
http://pro.sagepub.com/content/56/1/1491.abstract

Note that emotion is also conflated with aspects like priority and whether the response is a criticism or positive acknowledgement which will affect future interactions or even immediate attempts to "repair" non-existent faults.

I personally find it slightly easier to communicate with non-native speakers over email as any bilingual must have more experience handling ambiguous communication.

In working with native speakers in open floor plans, I have seen hilarious results that I would have found all the more hilarious if I were further away from the projectiles and had fully independent finances.

(But I will concede that English is a good language for talking abstractly about subjects that are clearly neutral where it matters little if nuances are misunderstood.)
Well I guess that could explain the 50% off rides promo they've been running in NYC for the past 6 weeks. Seems like every Sunday I get a push notification that it is extended.
What challenges do you face when testing web applications?
Pretty sure both altitude and speed were constant during the satellite deployment phase.
I'd like to argue Snowden is as pure as many of us wish he was in this case, but he, too, must unfortunately play the games of the nation-states that are more powerful than him.

Snowden is right in talking about MTProto's issues, and this is a case where he can talk about something both he and the Russian government dislike, albeit for different reasons. It's a fine line to walk to maintain integrity.
You'll notice that the speed decreases as the altitude increases. That's not maneuvering, that's just an elliptical orbit. There is no actual speed or altitude difference between the various releases, that's just the whole group coasting slightly uphill. Separation will be done by maneuvering the satellites afterwards.
What, exactly, did Blue Origin do that the X-15 didn't do 50 years ago? Other than the terrestrial launch, that's about all I can think of.
There would have been huge flooding anyway, it's pretty unclear if the dam failure added to the death toll. With one meter of rain in a few hours, very little infrastructure stood a chance anyway...
Uber lost 470m/period. As the article mentions, these figures are outdated by a number of years and completely irrelevant - Uber is hitting more than 2.5 billion in revenue (commission) this year.

According to public information, Lyft is losing approximately 3 to 5 times the amount of money per ride.
A couple of weeks ago we returned a rental car to San Diego, after a one way trip. We checked into the hotel, then were going to go to the airport for the return. We asked the clerk how to get back from the rental car return. "Taxi or Uber is your best bet, though I think there's a bus."

We looked on the map. The rental return was a mile away from the hotel, with sidewalks the whole way. We walked.
Let me be clear: could a C programmer understand and effectively use Genera OS without significant, paradigm-altering changes in mindset about programming? Probably not. So, I don't include LISP in a C-replacement discussion given they're in two, different ballparks. And LISP is universally hated by almost all programmers outside its own fans and those Clojure is attracting. That's despite the fact that I promote its advantages elsewhere where they might get take-up. ;)

Now, back to imperative languages with some familiarity to C programmers. For allocation failure, some languages provide exceptions to handle such things but I usually recommend allocating what you need at the beginning and being sure you'll know your max for later. Do the checks plus reserve early so you worry less from then. Shouldn't be a problem. It's work to keep in mind but straight-forward.

Far as string-handling, there's safe libraries and approaches to it. We just use them with whatever performance or syntax hit we get if our language doesn't do it inherently safe. The issues with it are why I recommend prefix strings for clean-slate stuff over null-terminated. If you can get away with it. Having separate types for the two can highlight interface errors.
Actually, thinking about it, if they staged a faux-rivalry, it would probably get more public interest in space. People can choose their team and have someone to root for and someone to hate.
It was a pretty "hectic" second from the burn in the sky to standing still.

Epic.
Also just as important as all of the above is a strong contribution to documentation and community - easy start guides, sample web applications that are more than just a TODO list, forums, email lists, etc.
OK, explain how the landing of the SpaceX first stage was many times more difficult? They used different mechanisms, yes (suicide burn vs. hover-capable) and the purpose of the overall system was different, but they are both VTOL rockets.

Blue Origin was first, and Bezos can quite rightly welcome SpaceX to 'the club' as the second company to achieve this, without being accused of being classless, surely?
This is exactly what I am looking for with feedback! Originally this was meant for a rural area where parking isn't usually an issue. However, my first thought to tackle this problem would be to actually have two drivers who ride together. If this situation comes up, the 2nd driver could drive their car home for a fee. This could help fund some of the costs as well. Lastly, this could help keep everyone safer and prevent some of the issues that arose with Uber.
Ok, yeah that would be nice. But no one has figured out how to securely do productive work for proof of work. In fact, there are pretty good reasons to believe that it may even be impossible to create a secure yet productive proof of work algorithm.
People elsewhere see it as good news because these concerns are overwhelmingly dismissed in most other cultures.
Interesting - something flaming separated from the first stage as it landed. You can see it separate, hit the ground, and burn as the landing completes.

https://youtu.be/O5bTbVbe4e4?t=2518
It's funny, with most vehicles you want to avoid being on a completely new, untested one. Think about it: would you be comfortable flying on a brand new 787 that had never been flown before, not even once? I sure wouldn't. Before long, maybe rockets will be like that too.
I join in congratulating SpaceX for this awesome achievement. It's like, holy fuck, they landed the rocket AND deployed 11 satellites, all in a single Pomodoro!

I also want to commend them for a few minor things:

- a real-time stream from landing (as opposed to holding it and releasing footage few days later, as before)

- a real-time stream from satellite deployment, with a camera placed so that we could see everything (as opposed to the typical low-quality stream of the engine nozzle)

- a launch timeline visible on the stream

This mission looked an order of magnitude better than anything they did before. It's like, before they were just playing around, and now they're doing serious business. Keep it up, SpaceX!
Well the theory of a bank is to act as an efficient mechanism to transfer capital from businesses and consumers with excess capital to those with a need for more capital. Of course in practice banks have got pretty good at capturing almost all the value out of this process.

Business should not really be in the business of retaining earnings. If it was not for tax reasons it would be best to return any excess funds to the shareholders and raise new capital when needed.
I used to bike from Herndon to my former office in Loudoun, VA. The W&OD bike trail is fantastic. It was a beautiful ride, up until the last few miles getting from the trail to the office park at Loudoun Station. The most direct route is to ride on the shoulders of Loudoun County Parkway in front of the Verizon building. There are no sidewalks, the shoulders are littered with gravel and cars drive around 50 MPH. Just, no. I had worked out a path that added about a mile but kept me either on sidewalks or side roads. I understand the argument that sidewalks are for pedestrians, not cyclists, but there are very very few pedestrians on those sidewalks. Loudoun really should put a path from the Station to the W&OD trail before the Silver Line metro comes in.