skysight-inc/HackerNews huggingface dataset:
In your experiments with spray polyurethane foam, did you use open or closed-cell foam? I ask because you said that in your experiments it didn't insulate that well. AFAIK, open cell foam has a lower R-value than standard Styrofoam polystyrene (~3.5 vs. ~5.0). Closed-cell polyurethane foam on the other hand has an R-value of about ~6.5. The problem with closed cell foam is the weight (2.0 per cubic foot vs. 0.5 for open-cell.

Even if it were too messy to use for the outer construction, it might be interesting to use it only for those components that are most temperature sensitive, such as the battery. This would also solve the battery dislodging problems you had with your first flight.

I'm wondering if anyone is creating a stereolithography machine capable of printing structures using materials designed for insulation such as polyurethane/polystyrene foams and silica aerogels (R-value ~10.0.

I'm also curious if using stereolithography to print honeycomb structures in a vacuum would be a good way to produce vacuum insulated structures (AFAIK R-values of 30 to 50 should be possible.)
> I personally would search for the mathematical formula and a text description that I could put on my second monitor as reference.

If you don't know the formula and they haven't volunteered it, you can simulate this search simply by asking, and any interviewer using this for a proper purpose will happily write it on the whiteboard for you and walk you through it if anything is still unclear. It's not what's being tested.

What is being tested is that you know enough about programming to understand pretty much nothing more than basic flow control, basic arithmetic and perhaps trivial IO.

A use of a question like this checks that you've at least read "programming for dummies", and roughly understand the overall concepts of programming not whether or not you're proficient enough to even fill an entry level position. It weeds out the candidates that are completely unable to program at all.

> Do you think they will be able to put there best foot forward in such an unnatural situation? They may blank, they may freeze and they may just be the type of person that reflects on an issue for a while before the set out to code.

I've had smart candidates blank on trivial problems, but there's a very noticeable difference between people who blank and people who just have no clue. With people who blank, you get them to calm down, you ask probing questions to get them talking, even if it's about the weather, and they will eventually start offering up small bits and pieces of an answer that makes sense and gets them to "unfreeze" and start solving the problem. Whereas with the type of candidates this type of interviewing should be used to get rid of, you get absolutely nothing and/or total bullshit.

> But first I would search for a standard library and avoid the effort all together.

That's something you might say as a "by the way", but it isn't what the interviewer will be looking for.

> I personally never work from verbal descriptions, I document the issue, and place it into a ticket system in which I work the tickets based on priority.

Fine, so consider the description on the whiteboard the ticket with your highest priority would be my response to that if a candidate were to raise this objection (though be honest, if they did alarm bells would already be going off in my head).
No, it has not. See this comment from x3c in the previous discussion for details: http://news.ycombinator.com/item?id=3428635
Oh, you forgot to mention asking blatantly illegal questions during the interview like, "do you have kids?"
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Heh, I haven't paid for an IDE since Turbo C but I've yet to hear a bad word said against this one. If it doesn't suffer from the occasional memory gobbling antics of Netbeans then I might treat myself to an early birthday present.
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I have been using netbeans and eclipse for a long time and can even remember using the abomination that was jbuilder... currently I am using an older netbeans version (6.1/6.8) for very specific product-centric development and it works just fine, there are a lot of great plugins to choose from and it integrates with pretty much all popular source control systems.

The same can be said for eclipse and I think there was a time when the eclipse framework was just so much "snappier" due to SWT that people forgot all about netbeans... but with more recent JDKs and more recent versions of netbeans, this isn't necessarily the case anymore.

IntelliJ has always seemed incredibly neat and those guys are doing a great job considering they are up against giants like sunoracle and IBM - personally the only thing that ultimately kept me from using intellij more at work was the price but I see they are offering personal licenses at a more reasonable price now so it is definitely a viable alternative to look at and try for devs.
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piratebay.org, btjunkie.org and other websites like those are already url-banned here in Italy. That didn't stop the downloads at all, afaik
Pretty impressive, but what does "no system-wide downtime" mean? So there was local downtime?
Just released for Python 3 as well.
No Comments, No-reply: Is There A Shift Happening?
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Here's one they forgot:

We don't make enough money to sustain ourselves.
Linux 3.2 has been released
Netflix is going to suffer death by 1000 cuts.

The problem with making money off streaming is it's easy to overcome all the technical problems of streaming these days - all they are doing is using Amazon's CDN.

So the content owners can just DIY when they want to squeeze every penny of profit out of it.
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v12?!. They really have gone crazy about versioning. Back when it was v3 - they used 3.6.24, 3.6.25 etc for minor updates. And then going up a version when major things changed.

https://wiki.mozilla.org/Releases - 6 week release cycle incrementing the version number each time?! Firefox 12 beta is probably available soon too...

Apparently FF7 "uses as much as 50% less memory than Firefox 4" - Nope it doesn't, still the same ever increasing bloated browser.
Ahhh, useful tip. I've just been using alloca instead...
I see you've gone to great lengths to make it lighter this time. Any idea what the relationship is between payload weight and balloon burst altitude?
No, this isn't "right". It may be right for a specific job with specific skill requirements.

I've been programming for over 25 years, and I've never had to solve any problem even remotely like it. I've also worked with dozens of programmers who could easily solve a problem like that, yet couldn't deliver a working application if their live depended on it.

Different programming jobs require different skill sets. There is no universal test.
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Small comment: I see this as a dart contender, from what I hear, there is a Visual Studio debugger coming, meaning we will be able to debug c#, but have it walk through javascript on page. Sounds amazing to me, thought I should share.
Follow the link in the readme to more detailed documentation. The amazing thing here, is that the produced javascript is small enough to warrant using it for real projects.

The compiler is not yet open source, they said that if there is more interest, they will open it later.
If you don't read the text below, you're missing the best part. (No offense meant to the superb design work, of course.)
Will You Pay for a Responsive Redesign?
Show HN: Stellar.js
I am with you on this one. I occasionally dip into codeigniters built in profiling as its useful for finding slow queries, but generally for anything other then SQL XDebug is a much better solution then mucking around wrapping code to profile it.
Oh, I'm sure it can be protected, no doubt. And you probably don't even need scrambling, just generate a random AES key for each torrent and distribute it only to the people who you shared the torrent with - passwords aren't needed.

I was just looking if it was actually protected or assumed public.
Maybe the MPAA boss will propose the same thing next to stop piracy, especially if SOPA passes and still fails to stop piracy.
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Small comment from me: I see this as a dart contender, from what I hear, there is a Visual Studio debugger coming, meaning we will be able to debug c#, but have it walk through javascript on page. Sounds amazing to me, thought I should share.
Follow the link in the readme to more detailed documentation. The amazing thing here, is that the produced javascript is small enough to warrant using it for real projects.

The compiler is not yet open source, they said that if there is more interest, they will open it later.
I think the burst altitude is far more related to how full the balloon was. Fill the balloon a lot and you get a fast ascent but a lower burst, underfill and you'll get higher for the same payload weight, but of course you get blown further.
I would challenge this by asking the following questions:

1. Is it non-obvious enough?
2. Would the patent realistically benefit the inventor?
3. Would the patent benefit the society at large?

1 - Physical devices often require lots of engineering work, prototyping, testing and refinement before they really work. Patents aim to protect your investment of money and time into all that stuff. This is not applicable to pure ideas. Once you thought of something like fountain codes, you instantly know they will work and you even know how. There is no investment to protect.

2 - Just because something is useful doesn't mean people will use it, even for free, and the act of patenting a generic algorithm will certainly drive most potential users away. Not because licensing costs money, but because it's a hassle and a liability.

3 - This was covered in many other posts here. I'll add one thing. The fact that it's just an idea (and a generic one that that) means other bright people who need that idea are likely to come up with it on their own. In that case a patent would be clearly counter-productive for the society. Why should the first 'inventor' of the algorithm has all the rights to it, while the second would have none?
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I would like to do something so that Iranians can continue accessing the Internet. I'm thinking contributing money or time to hardware related projects via which Iranians can totally circumvent the Iranian Internet infrastructure completely.

Any ideas, HN?
And hopefully not "defeated" as in "renamed to 'Flags for Orphans act'"
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I care about free stuff if random fuckbags are getting it and me, a loyal customer, isn't getting it.

And it is because I care about service that I don't want floods of idiots blocking my queue and being rude to staff (who then have to serve me) just so the can grab a free thing and go.
As much as it seems like common sense as that page would exist on Wikipedia, it had never occurred to me, Brilliant - Thank you.
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They could also just block all SOPA voters from access to there services. Most of the pro-SOPA companies have knows IP-ranges.
If your marketing is mostly online and you're targeting more geeks, then a cool foreign domain is fine.

If you're targeting the masses, and marketing in print, then you need something more obvious which is easy to phonetically speak.

Having said that, I've seen some awful "dot-coms" read out on TV ads and radio ads over the years...
Yep, great successor to Lions' Commentary on UNIX 6th Edition.

Another great book in the same style is Notes on the Plan 9 3rd edition Kernel Source, also free: http://lsub.org/who/nemo/9.pdf

Plan 9 might be obscure to most HN readers, but fundamentally these books teach concepts, and the code base is much more clear and understandable than mainstream kernels.
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You should! :) A couple of years ago I was skeptical, "Why would I pay that if I can get something good for free (Eclipse)?" Once I tried it for 2 months (now the trial only 30days), I couldnt help but buying the personal license. just happen that they had discount on easter.
The book also discusses that. When the problem is _not_ about a life-changing amount, it is better to take the riskier choice when the expected utility is the same. The explanation is long-ish (and honestly, almost above my head - took me awhile to grok it) and involves the sum of all such incidents over a lifetime, and differences in accumulating utility vs accumulating wealth.

Maybe someone who read the book more recently could take a stab at describing it.
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This is not an ideal fundraising instrument for a startup, because it is likely the fair rate of interest will be higher than the loan amount itself (ie >100%).

For a pre-alpha startup, think equity. Any investor will want their chance at a return which reflects the opportunity costs and risks of their investment.

Edit: stock makes plenty of sense for investment. The purchase of equity is the same as buying a stake of future cash flows, whether this is as growth or dividends. Note that responsible directorship applies.
Run more Tor relays, I guess.

Tor is, at least according to Tor stats - https://metrics.torproject.org/users.html?graph=direct-users... - used intensively in Iran and Iran is not very effective in blocking it (unlike China) - 11% of all Tor users are from Iran, which is a lot, considering their population (45664 users daily)
New Chrome Beta release renders web pages as you type, screens downloads
Umm, I think a malicious user could write things in your status that could have negative consequences for you.
But an overwhelming 93% said that they will not undertake a redesign initiative in favor of a Responsive Design.

You were able to interview friends and relatives regarding "responsive design" and 93% said they were in favor of this responsive design stuff? Wow, you either have the most brilliant friends and relatives or there's something wrong with that figure. Heck, I can't even explain what programming is to most of my friends and relatives.
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Rational towards what end? Maximizing expected gain and minimizing variance are both reasonable metrics.
Well it's a distributed data store so I guess at times they took down certain nodes for upgrades or fixes etc then bought them back up afterwards where they became consistent again. This probably wouldn't have had any user impact.

These distributed data stores are so appealing from the perspective of uptime and stability.

Needing to upgrade the DB or take cold backups or run massive schema migrations is the reason for lots of scheduled downtime.

And removing the huge whopping single point of failure from your system that you would have with a traditional RDBMS can only do good things for your stability.
PayPal is the quickest solution, not the best one ! Moreover most advanced features to integrate payment directly on your web site are available un US/AU/CA/UK only.

We recently had the same problem, mainly for recurrent billing, and the overall scenario is quite depressing in Europe.

The process of being accepted and setting up a payment gateway and merchant account is very long and require tons of documentation. We checked recurly, chargify and cheddargetter.
All of them have some EU partners but they rates are often very high and responses are slow.

After two weeks of investigation right now I would suggest you cheddargetter (https://cheddargetter.com/). You'll still have to go through lot's of papers and bureucracy but at least their support (both from them and from their EU partners) is very quick. We set up an account, opened a ticket to be helped setting up merchant account and within 3 hours we've been helped and immidiately contacted by their european partner to set up our merchant account.

However, if you're not looking for recurrent billing, there could be more convenient local solution in your country provided directly by banks. Another respected solution in Europe is Ogone. We used them for a couple of our clients and they're at least decent :)
You don't. I do everything from a single perspective.
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Yes, neatly circumventing all of the clever algorithmic complexity optimisation that the interviewer is apparently looking for, and making this an even worse interview question.
Lot of webGL these days. As you are directly working on this technology, I would like to know how the future of it is going to be?
Here's a macro. There's some issues :) The biggest one is you have to make sure to put the multiple divisors list first.

The call is

(fizzbuzz (100 (((3 5) "fizzbuzz")(3 "fizz")(5 "buzz"))))

(defun make-cond (item)
(let ((divisors (first item))
(exclamation (second item)))
(if (listp divisors)
(let ((div1 (first divisors))
(div2 (second divisors)))
`((and (= 0 (mod n ,div1)) (= 0 (mod n ,div2)))
(format t "~a: ~a~%" n ,exclamation)))
`((= 0 (mod n ,divisors)) ;else
(format t "~a: ~a~%" n ,exclamation)))))

(defmacro fizzbuzz (params-list)
(destructuring-bind (num-to req-list) params-list
(let ((cond-list '(((= 0 n)))))
(loop for item in req-list do
(push (make-cond item) cond-list))
`(dotimes (n ,num-to)
(cond ,@(reverse
(push '(t (format t "~a~%" n))
cond-list)))))))
Nice idea.

If Flotype inherited NowJS' concept of one namespace for both server- and client-side it's a very smart thing built on NodeJS.

I am sure there're tons of companies who would love to get a out-of-the-box real-time communication system w/o going too deep into node.js (which is btw perfect for this job).

The idea behind nowjs is great but still isn't that trivial—your code has to be build around their core concept and at the end of the day you are pretty dependent on one sole company for core functions such as communication for your product. Further, there's is more to consider (are messages saved, if yes at flotype or do I have to build my DB and so on) and you quickly face the make or buy decision because with taking NodeJS and building your own communication stack on top. I want just to say that an integration with Flotype is more than just adding a one-liner—correct me if I am wrong—and currently it's too risky to rely on a new product which future is unknown. The point or what I am feeling uncomfortable with is that it's just proprietary tech.

I think Sri will solve this issue (maybe with a freemium model where also the sources are under a public license and you pay money just for the servers)
There are many intelligent people in Iran, and they have the privelege to see this unrolling in front of their eyes. Wake up, before you become North Korea.
Looking at the context in the article, it seems that the government is running scared of dissent, and is now cracking down further and further.

The citizens they talked to seem to be dismissive of the attempts, and one wonders if the government is going to squeeze too hard and cause a backlash.
It seems like extending the operating life of the device is ideal since then it could tolerate a much slower descent and burst much higher.

On #highaltitude, what were the highest altitudes others have achieved?
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Assuming they even know what ICS is then not at the expense of their warranty, support, Amazon integration.
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wass say? ;)
Thank you all for the names and suggestions, I will check all sites mentioned and see what fits best.
I believe the record is just > 40km
Depending on how long it takes a call to be dealt with it might be worth telling GAE to never spin up more than one instance. Sure, the occasional user will have to wait a couple of extra seconds to be dealt with, but you won't have to worry about cost.
Do you know if this can be used with Jabber and if the messages are sent on an encrypted connection to the server?

If not, any good apps that do for Iphone or Blackberry?
Just some comments:

> She probably would have sold a few copies before you'd be able to do that; and maybe you could produce a slightly modified version that would be better.

I don't even know what "better" means in the context of works of art. In any case it's about money: You would see it justified to cash in on someone else's work after she "sold some copies"? Also this remembers me of the common practice of the ripoff: "hendrix' greatest solo's": not mentioning that they were recorded by john doe .

> It's worth noting that some of the best works of mankind were produced when no copyright was in place, so the argument that associates copyright protections with content creation is weak at best.

It is not weak for that reason. Currently works which are commonly copyrighted nowadays are reproduced very easily: lossless copying, printing, electronic editing etc. Try that with the sistine chapel. You would have to clone the Borgias first. Quoting is indeed very common in art but it does not compare to copying. I think that the circumstances are not comparable.

> Derivative works are authored all the time.

Yes. See above. But selling Harry Potter with some changed scenes is a ripoff and not a derivative work.

> Most of what Disney ever produced is derived from popular classics from the 18th / 19th centuries (I remember that in "The Hunchback of Notre-Dame", the original author, Victor Hugo, isn't even credited)

Completely agree. Disney is indeed fishy what concerns his copyrights based on other's efforts. But honestly: when and why should you be able to cash in on coffee mugs showing disney's rendering of the seven dwarfs?
Yes, I've seen a bunch of shell and perl utilities that use this approach. You can't use them when you want 256 colors.
You can check http://cbouvi.free.fr/download/colorize/ and http://code.google.com/p/ansi-color/.

Ruby has highline and colored, and perhaps some more too.