skysight-inc/HackerNews huggingface dataset:
If we're playing 'guess-the-acronym', I'm going to depart from something Mars-based and suggest that the 'C' is to do with 'Cryogenic', and that now that they are more confident with engines they might be switching to a harder, but much higher performance, fuel combination like liquid oxygen with liquid hydrogen.

Whereas LOX+Kerosene has a Specific Impulse (crudely the amount of 'go' you get from a pound of propellent) of about 340s, LOX+Hydrogen engines have an Isp of about 450. That's really a huge increase in terms of what you can launch with a given size of rocket.

Tom Mueller, the head of propulsion at SpaceX, previously worked for TRW (the company that did the US's ICBMs in the 50s) and while there he worked on a LOX+Hydrogen engine, the TR106 ( http://en.wikipedia.org/wiki/TR-106 ), which was a beast.

It's harder to work with - both propellants are very cryogenic - but any rocket engine designer will be very aware that LOX+Hydrogen is hovering at the top of the evolutionary ladder looking mighty attractive for those that have the resources to take it on - a position Space X find itself in as they become more mature and heavyweight. They're already looking at it for their replacement Upper stage vacuum engine for Falcon 9 - the Raptor ( http://en.wikipedia.org/wiki/Raptor_(rocket_stage) ).

Also, almost any Mars mission would involve a lot of heavy lifting into low earth orbit to construct a vehicle that would transport people there and back. A space vehicle that can support several people for say 2 years, and move itself to and from Mars, is going to by way bigger than anything that can be launched by a single rocket all at once. A big heavy-lifter whose engines have a much improved Isp (which rather relaxes the expensive mass saving measures you need in the rest of the rocket to launch a given payload, or alternatively lets you launch a much heavier payload for the same vehicle) is consistant with a mars road map.

I doubt they would undertake something like this just for Mars - developing rocket engines is hecka expensive. SpaceX got started by inheriting most of the cancelled FastTrac project from Nasa ( http://en.wikipedia.org/wiki/Fastrac_(engine) ) and indeed still outsource their turbopumps (the hardest bit of an engine) to Barber Nichols, who did the design for Fastrac. That was a great move on their part - starting with a blank sheet would have been madly expensive and very slow - a working baseline engine design is a very high-dimensional optimisation problem, before you even get to cutting metal. My point is, if they're now starting clean-sheet engine design, I'm sure they must have in mind some way for it to pay for itself because it's a hugely costly business.

We live in interesting times!
Good catch, I just quickly glanced at the figure without remembering the hourly rates still apply. Going with the yearly-reserved Micro you're at $128 for the year, which is a bit more than many shared hosts but at least you have absolute power over the software.
The high IQ is a bit of a miss—it covers the spectrum, although it is certainly true that there was a tendency for high-functioning people from relatively affluent backgrounds to find their way into a recovery setting years ago. Self-selection was certainly part of it, but we have to keep in mind that more effort would generally be put into "salvaging" somebody who had displayed a lot of promise once than someone who would be a lot easier to write off.

The despair, though, isn't far off: chronic depression, or dysthymia, is common among alcohlics.
You're looking at it the wrong way. Of course saying the average IQ depends on religious belief is nonsense[1], but the other way around ie. saying the likelyhood of believing in religious stuff depends on how high your IQ is might make sense to some people.

1. Religion tends to suppress and influence education, if that has any effect on the IQ of the population has yet to be proven
Why make the assertion that wealth is the underlying cause?

I think it's more likely that it's more religion -> less wealth -> poorer health -> lower IQ.

After all, ultimately, wealth is not a cause, but an effect. Wealth is produced; it doesn't fall from the sky.
I'm curious. The first time it was posted, you indicated that you were trying the thirds homework idea.

How did that work out?
you're right, they are completely different fields.

However one of the more likely methods of construction (from this distant point anyway) would be a launch of lots of material, tie it all to some asteroid or other large counterweight that has been put in space a good 90,000+km away, and then unspool it all to the surface, which would require a good and cheap heavy launch capacity

(I suppose you could say if we are going to do such an undertaking as build a space elevator, with all the billions it may entail, then launch costs to get it going will probably be the least of our worries, but as far as I see it, every little bit helps!)
Avoid ghost views in you Backbone.js application
News, Status & Discussion about Standard C++
The US spent 2001-2009 terrorized by militant Christians.
As far as Windows 8 goes, I have already made up my mind. This is the 'review' that sealed the deal for me http://youtu.be/X0fsyb-ttcw
There is one language to kill JS and Dart. It is TCL and it is here with two decades of development and sane. Why develop these languages when TCL has everything and can run in the browser or even with NaCl.
There are underwater casings and a lot of other gear which can be used with the GoPro. And the compact camera style, according to me, is more flexible and appropriate for that.
Facebook India is Paying $1 To Register Through The Mobile Site
Read up on the neo-conservative philosophy on Israel and its support from Armageddon Christians.
"finally" clause in C++
I wonder how easy it is to actually contact Microsoft on matters like this? It would probably take hours upon hours of searching convoluted corporate websites just to get an e-mail address or phone number to contact. Just slamming it on the web and posting on hacker news will take less time and is sure to reach Microsoft's attention quickly :) Sure, it's not responsible but not everyone is.
Perhaps it's because IQ has it's own fair share of problems and focuses on specific types of intelligence. It also has massive cultural bias.

Some would go as far to say it's entirely meaningless.
If the computer were fast enough, that'd be the easiest way to do it.
Compare the comments on this story to the ones found here: http://news.ycombinator.com/item?id=1834976

What's the qualitative difference which elicits a different response?
True, but when I work in a busy vibrant office, surrounded by interesting peers excited by their work, my productivity goes through the roof - I feel like a cheat spending time on Facebook or <gasp> HackerNews.

When working from home or in a dull share office...
OK, conversely, you're saying that you should do the wrong thing (as in this case), if there is no financial incentive?

Given you aren't going to get a reward either way, why not do the right thing?

Frankly, I can't believe I need to discuss the morality of this. Is it not obvious?

And yes yes, I realise this is probably a case of Hanlon's Razor, not a moral failing, but justifying it on the grounds of there being no reward is crazy.
Holy cow, I would not have guessed that this thread would be where you least trollish post of the week would be.
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After losing the job, H1-B holder is supposed to find a new job or go home within the grace period of 90 days. There's no "significant period of unemployment". Where are you getting your facts from?
How are these data valuable without corrections for other potentially explanatory factors like wealth/GDP, education, etc.?
Well for what it's worth, I've actually worked as a NYC taxi driver. I can tell you the TLC is damn near a mafia organization. They are probably scared of new tech moving in on their tight control of NYC cabs. I'm guessing any move on their part of "looking to loosen rules" is just a PR bluff.
So one gets down-voted for stating the truth that Java is not constrained to the JVM, great!
If you're saying that the entire meaning of this post is contained in the gender of a transitory person, conjured merely to be a demonstrative object of his essay, then what you are saying is dumb.

He's not trying to avoid being sexist. What's sexist is to assume that there is some ulterior reason why the object of his essay would be a woman. This despite your professed appreciation for counter-sexist efforts.
Mobile isn't just 3.5" displays. And some of us DO need to log in and do things while we are on the go, we don't get to sit at a coffee shop and whip out our MacBook Air every time there is an issue.
Your research into a billion Muslims' minds seems untwitching...
I'm fairly skeptical about IQ, but levels of religious belief may correlate with wider social factors. An interesting source is:

Gregory S. Paul. Cross-National Correlations of Quantifiable Societal Health with Popular Religiosity and Secularism in the Prosperous Democracies: A First Look. Journal of Religion and Society, Vol 7, 2005.

http://moses.creighton.edu/jrs/2005/2005-11.pdf

Quote: "In general, higher rates of belief in and worship of a creator correlate with higher rates of homicide, juvenile and early adult mortality, STD infection rates, teen pregnancy, and abortion … None of the strongly secularised, pro-evolution democracies is experiencing high levels of measurable dysfunction.” Within the US, “the strongly theistic, anti-evolution south and midwest” have “markedly worse homicide, mortality, STD, youth pregnancy, marital and related problems than the north-east where … secularisation, and acceptance of evolution approach European norms".
I felt the same way when I read the "startups are hard" post from jazzychad. I think he talks about taking a cruise in that?

The real lesson is just that things are only hard if you let them be hard. The good news there is that you can control how hard things are. You just need a bit of perspective on life.

I used to find things hard, then I started charging more, worked less, had 2 kids, moved to a beautiful seaside town and stopped caring about "success". Now I find things awesome, but I'm still broke :)
(2) cheap polo onsale
I will pick more than 1:

Ubik by Philip K. Dick (it's hard to cherry pick his best work though, ask me a different day and I will choose The Three Stigmata or Do Androids Dream or something else)

The Stars My Destination by Alfred Bester (simply a good story and a great background)

1984 by George Orwell.

What all these books share is the idea that sci-fi is about social, cultural and economic dynamics, not ships or time travel.

That is my definition of sci-fi: An on-going essay about the evolution of the dynamics of society, using exotic technology/science merely as a catalyst.

Runner up: Ender's Game by Orson Scott Card

Could never finish (can't recommend):
- Neuromancer
- Cryptonomicon (Does the author feel entitled to mock the homosexuality of Alan Turing? Found that somewhat arrogant and in bad taste.)
Then, in answer to the question "Why are people hellbent on using Postgres" I'd say it's to do the kind of searches I described, which are a native feature of spatial databases like PostGIS and Oracle Spatial.
I have been using dart for a couple of months now and am extremely happy with it. Code completion on the DOM API is a different world to the classic javascript edit-test-fix syntax error cycle.

The language and the vm are a distraction. The huge win with dart is what the IDE will do for your productivity.
Hydrogen brings absolute oodles of troubles with it. For upper stages, where it is much more critical to minimise the wet weight, that trouble is generally worthwhile. For lower stages, not so much -- it's generally FAR more cost-effective to just build a heavier stages which will do the same job, but with lower ISP. In the past, SpaceX has always made the (correct, IMHO) decision to optimise the cost-efficiency of their rockets, rather than the propulsion efficiency, and hopefully they won't stray from that path.

(They've said in the past that they're working on a LH2 upper stage already, so if you see them building up a cryogenic capacity, that would explain why).

Also, I kinda miss the days when they could get away with calling their next generation rocket the "BFR", and no true geek needed to even ask what that stood for.
I haven't read all the comments sorry if this has been posted already. I think you guys would enjoy listing to this discussion about TypeScript, Dart and JavaScript between Anders Hejlsberg and Lars Bak the guy behind V8 and co-creator of Dart.

Link: http://channel9.msdn.com/Shows/Going+Deep/Anders-Hejlsberg-a...
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this only works if the email comes from that domain. Facebook, I think, switched to setting the 'from' email using the users' registered emails (i.e. the user who posted on the group wall seems to have sent you an email by doing so...)
Well, religion (mythology) is the result of humans not understanding something and attempting to explain it using fantasy elements. Which is very normal and natural.

So if a society currently lacks the education or intelligence to understand complex scientific principals of course they're going to use fantasy to try to understand the world around them. Once people understand the world around them using non-fantasy or non-religious explanations, they usually abandon religion.

The way I see it, science and religion are just 2 different ways of achieving "understanding". All humans want answers, and will get those answers using which ever method, science or religion, they have access to (sometimes both).

So apparently:

- Religion causes people to have low IQs (No)

- People who are religious are usually of a lower intelligence (Not really)

- People who are of a lower intelligence usually tend to be more religious (Yes, usually)

- Some people are both very intelligent and very religious (Yes)

If these observations are true, how much of society will be offended by them?
I'm going to add a link to this most excellent book about rocket propellants called Ignition!: http://library.sciencemadness.org/library/books/ignition.pdf. Foreword by Asimov himself, who was friends with the author. It's an entertaining description of years of work on the topic.
This wouldn't work for me. I would set this up then procrastinate trying to figure out how to get around it.
This is complete bunk.

Why? Because firstly, IQ is flawed because it fails to take into account different forms of intelligence - for instance, an African living in the bush may not be as good linguistically, but will be a far more "intelligent" hunter than the average western person. IQ tests have been repeatedly criticised for failing to adapt to cultural differences, and are effectively geared towards a western understanding of human intelligence - essentially, it's like comparing a long jumper and a sprinter, having them both sprint, and then declaring the sprinter is a better all-round sportsman.

Religion could also be linked to, for instance, poverty or desperate conditions. It's all very well sitting back in our cities with power and relatively good pay and oodles of free time, philosophising to ourselves and declaring that god could not possible exist, but for people in packed, impoverished slums, religions serves as a motivator, either by being the only thing that gives people hope, or principally because one is taught it at a young age and doesn't have the time or education to question it with science or reason. This has nothing to do with a "lack of intelligence". Religion is also a much greater part of society - think about England several hundred years ago - many of the great minds were religious, simply because it was just the given thing to be, it was the Zeitgeist.

Apologies for the aggressive tone, but this study just reeks of cultural imperialism and sneering at others without really attempting to understand anything.
Thanks!

I agree with encryption features, so I created a different branch (dev-noaes) without encryption - and of course without the bouncycastle dependence, in this way the complete library to include is really small!

I will add soon the new methods for database creation, it's a good idea!

best,
aw4y
Indeed, as I say it's very much harder to work with, but it's worth a revisit with 2012 technology, I think. I also am involved with oxygen+hydrogen rocket propulsion research but can't really discuss it much here. But things have come on a bit in the last 30 years :)

Re: 'BFR', well I have a few hypotheses about 'MCT' in a similar vein but I reasoned they might be a little bit blue for HN!

Edit: A better reason for first stage hydrogen occured to me over a cup of tea:

> "SpaceX has always made the (correct, IMHO) decision to optimise the cost-efficiency of their rockets, rather than the propulsion efficiency, and hopefully they won't stray from that path."

I think the economics change when you try and go reusable in the way that they are. Lox Hydrogen engines and tankage might be more expensive, which is obviously a factor in an expendable vehicle, but if you reuse the vehicle, and have to keep enough fuel back to land, as SpaceX plan, I think actually the equation goes far more back towards optimising for propulsion efficiency in order to get the cost efficiency. The launcher cost metric is basically dollars per kg into orbit, and for a given reusable rocket, lox+hydrogen will get many more kgs into orbit than lox+kerosene - you need to keep much less fuel back in reserve to land the various rocket stages, and the extra fuel you can use on the ascent is also a lot more thrusty per unit mass. I wouldn't be surprised, assuming you sell at a dollar/kg price, if lox+hydrogen ended up being much more profitable in reusables than lox+kerosene, everything else being equal. I have not done the sums though.
What, no FF Chartwell?

http://tktype.com/chartwell.php

As long as you can turn on ligatures in your font rendering API per-platform, this is a fully cross-platform solution to graphing, in a font file.

(Using printf's, basically, to do complicated graphs - absurd and awesome!)
Like email for e-mail?
Obviously developers and hackers should be entitled to enough paid time off (http://www.replicon.com/time-off)
She did WHAT in school? The mechanics of a Facebook worm
Interesting... Thanks for the tip!

Middle click does work on my Windows 8 start screen; it always launches a new instance.

It doesn't do anything on my Windows 7 machine's start menu, though. But that's no problem because left click does what I want.

Testing a bit more... Now I see! In Windows 7, middle click works on the taskbar but not in the Start menu. In Windows 8, it works on both.
Hey, I absolutely agree evolution is slow to catch up. But the thing is, we gotta live with what we've got. (Kinda like an election with two lame candidates.) That is the challenge. We're better to work with what evolution has equipped us than to ignore it. We have to be realistic.
Dare I say it? We occasionally need to be _reasonable_. (Hello Apple.)

If I understand you correctly this time, you're saying we would have gotten a better deal if Microsoft had not been able sue competitors. Even the Gates Foundation, with all its billions, can't manage to achieve world peace or universal equality.

I read Maskin's paper from 1999. His basic premise was that software didn't need patents to reach a high level of success as an industry. And when the rampant software patenting started, he says it did not boost the industry. But he seems to think that this example of one industry sums up the entire role of the patent system, for any industry. Still not sure I buy that. If he has done his homework on other industries, e.g. pharmaceuticals, he is not showing it in that paper. Maybe I need to read more of his papers.
Thanks for the detailed explanation (though I'm still puzzled as why regex is being used on a non-regular language here)

I wonder if all of this will one day be replaced with a canvas-based RTE.
My comment serves no purose other than to say YES. I love this book dearly, it's probably the best written and most enjoyable niche technical book ever written. It's an absolute gem. I high commend it to people as an excellent short read. One of those instances where you say 'why on earth would I be interested in the history of liquid rocket propellents?' but you should read it anyway - it's massively enjoyable, some bits are laugh-out-loud funny, and a tour de force in technical writing and communicating complex ideas to non specialist readers.

It actually got me into rocket propulsion research, having been a signal processing, ML and control theory person by background. May I offer it my highest commendation to the curious HNer and thank you baq for providing a link to it.
It's been done a few times. Biomega and Puma made a bike with a structural wire that could be used to lock the bike; cutting the wire made the bike unrideable. There's the n'lock, which lets you turn MTB style handlebars sideways for hallway storage, but also acts as a theft deterrent, since you can't ride the bike with floppy bars. Removable pedals (Wellgo QRD, MKS EZY, etc). And dozens more.

There's a problem with designs like this. Bikes are very portable; thieves can walk with them, shoulder them, stick them in a van. The designs do not discourage the thief from cutting your U-lock in the first place - they only discover the bike is unrideable as they try to leave, and your bike still has value in parts.
Land of the Free: Green Party candidate arrested for trying to join the debate
> During an April interview, SpaceX president Gwynne Shotwell discussed a project with similar characteristics, describing engines with "more than 1.5 million pounds" of thrust.

For comparison, 6.7MN (1.5 million pounds) was roughly the thrust of Saturn V's F-1 engines (it had 5 on first stage and that many J-2 — at a mere 4.4MN each — on second stage), and it had an LEO payload quite a bit under those asserted here (120t).

Going beyond that means SpaceX is going to compete with the Zenit's RD-171 (~8MN), which is the current holder of "most powerful liquid-fuel rocket engine" title (the shuttle boosters are the holder of "most powerful rocket engine" title at more than 12MN each).

The Merlin page[0] seems to confirm that, suggesting the Merlin 2 is planned for around 8.5MN. That's absolutely enormous.

You still have to wonder how many of these things they'll put on a rocket to get it to push the expected 200t to LEO: the original Energia only lifted 100t to LEO with 4 zenit boosters (so 4xRD-170) and its own engines (4xRD-0120 at 2MN each), there were plans to have a 200t-lifting Energia… by strapping 8 zenits to it

[0] http://en.wikipedia.org/wiki/Merlin_(rocket_engine)#Merlin_2
You can reference a viewBox when referencing an SVG. This uses fragment notation in the URI. It would clash a little with a proposed syntax for native sprites for images (was recently brought up on the www-svg mailing list), I don't know whether or how it was resolved yet.
Instagram popular page has been gamed by thousands of Spam accounts
Interesting! You dont have the squares. This is a hint that the squares in my version are due to floating point limitations.
I've worked at places who wouldn't hire you if you could answer these questions. They had specific "we don't hire anybody who would get a PhD" policies because they didn't want you "in your head" all day.

Those "companies" failed.
Genesis: On History and Computer Science