skysight-inc/HackerNews huggingface dataset:
This seeems to use gaseous helium but other than that it seems to be close to the reason. The last thing you want is for any of those heat exchangers to break, as you are effectively mixing the components of rocket fuel.

The main reason though seems to be the temperatures involved. They are exposing hot air to near liquid helium (thanks to being cooled the the liquid hydrogen), thus cooling the air before it reaches the compressor etc that will make it suitable for the rocket engine proper.

At the same time they seem to be heating the hydrogen up. Easier to ignite a gas, or something close to it, than liquid. Just look at how your typical car engine works (never mind a fuel air explosive).
My point, and the reason I will still say MDBM is garbage, is that you can get mmap/zero-copy performance without sacrificing reliability. Only a fool would argue for the performance without reliability when they can get both. And with a lower total system cost.
"Strong Opinions, Weakly Held."

Also, quotes are a good way of appearing wise.
> You could construct any number of 2D materials that exist quite happily because they're close to some local minima or other, or because of some quirk of the potential forcefields you use ... though useful, classical molecular dynamics is also quite dumb

I believe you're thinking of the state of simulation in the 1980s. There's been quite a bit of progress since then ;)

For my work, I'm using a new reactive forcefield that's based off of DFT calculations and has a very close energetic match with experiment. Another forcefield I have used is optimized for structure and almost exactly reproduced neutron spectra for a variety of hierarchical materials, including long-range order (and that was from model systems alone).

Also, QM-MM methods have recently become more popular with additional computational power, so the parts that have significant non-classical effects can be computed correctly without wasting computational power on the parts that aren't going to make a difference.

As with any tool, molecular dynamics works very well if you know the theory behind it and know what you can and can't use it for. Structural carbon simulations is one of the areas where a lot of good forcefields exist (AIREBO for instance).
Man, this brings me back. Couple of noteworthy entries from the lands of the ex-Yugoslavia:

Orao (Eagle): http://en.wikipedia.org/wiki/Orao_%28computer%29

Galaksija (Galaxy): http://en.wikipedia.org/wiki/Galaksija_%28computer%29

VUK (Wolf): Only in Serbian, magazine scan from the 80s... the graphics screenshot looks incredible for the time: http://retrospec.sgn.net/users/tomcat/yu/magshow.php?auto=&p...
Seriously, why?
Injection molding has far lower cost, higher quality, and you're talking about things that are very cheap and easy to ship.
What does 3D printing bring to this?
BPG Image Comparison
It's less about being hard to calculate and more about being annoyingly unnecessary.

A basket of 10 random goods in a grocery store may have wildly different taxes applicable to them.. there are sales taxes, sin taxes (on tobacco, alcohol, etc), and others. These aren't listed on the price tag, so are essentially hidden.

Here in Fiji, I walk into a grocery store with $100 and can arrive at the checkout counter knowing I have $98 worth of goods and can expect $2 change for my bus fare home. I don't even have to know how to multiply numbers to figure this out... simple addition gets me there.
nobody goes on work trips fri-mon :)
The title of this article should read "The Californian Ideology" rather than "The California Ideology".
The first episode (http://en.wikipedia.org/wiki/Decalogue_I) is the most poignant of all I think. If you are, like me, teaching your young child how to program this will be both very interesting and heart wrenching to watch. Note that the father's name is Krzysztof, which may refer to either Kieslowski or to Krzysztof Piesiewicz with whom Kieslowski collaborated on the script or both, perhaps hinting that this may be one of the more personal episodes (Kieslowski's father was an engineer, too).
Ah yes, I think we might actually be somewhat on the same page, at least in terms of our exploration of these things.
I don't think scaling this up is a question of inertia it is more a question of weither a material exists that can be used in those flexural joints with much higher loads.

This is a material science question. A material may exist that has the right combination of flex, strength and lets also not forget durability. I am a mechanical engineer and crack propagation and cycle fatigue would be a major concern for a joint like that at large loads. There are all kinds of amazing tricks material scientists know how to play to combat these types of problem.

I think this could be scaled up if material to make those flexure joints exist.
perhaps off topic, but evfolds algorithm looks very close to estimating a Markov network. Can anyone comment on how their model differs from a Markov network, and how these differences arise?

For reference, given some variables, a Markov network is a parsimonious way to express arbitrary covariance matrices in terms of individual interactions between groups of variables (in this case, pairs of variables). Their approach looks very similar to estimating the Maximum Likelihood or MAP graph.
Tells a lot about current human civilization:

"The technology for the Fukushima-reactor cleanup stalled when scientists in Japan couldn’t get the powder to work, and the postdoc who developed the method was unable to get a visa to go assist them. "
> Just have it query 'xkb-switch' or 'xkblayout-state

said the other hundred of devs who now have to handle APIs to N OSes * M versions * X custom IMEI input solutions out there.
I would like to cite Newton here. Specifically his work on gravity as it applies to motion.
LA mayor and Taxi Commission propose mandating the use of transportation apps
FYI - some media queries added for some of the iPhones that make it more viewable on those devices.
In the case of my daughter, an uncomplicated pregnancy almost resulted in her death. She had severe MAS when she was born and could not use her lungs. It took a team of nurses and a doctor to keep her alive long enough for a medivac to another hospital with a NICU3. She ended up on ECMO (life-support) for 10 days and a respirator for another week after that.

I have zero doubt that had she been born at home she would have died or had severe brain damage before she could get to a facility capable of saving her.

I am a huge opponent of having children away from medical facilities.

As the GP said, it's uncomplicated until it isn't.
There hasn't been a scientific study on the limitations of science, so really whether it is limited or unlimited... nobody knows.
What I took most from this is that the continual battle of whether graphene will indeed be important as a semiconductor rages on. I remember back in the day when I first heard about it I wanted to hop in and invest like Texas instrument with silicon. I guess at this point it's a guessing game.
The Simple Model That Has Made Product Hunt Incredibly Addictive for Thousands
Kahn Academy's stated mission is to "providing a free world-class education for anyone anywhere." They claim to have content aligned to every standard of the Common Core. This is exactly how Meyer represents their position. I don't see how that is a straw man.

It sounds like your argument is that KA doesn't actually claim these things and that it is not reasonable to evaluate it on those grounds. I don't think that finding that Kahn Academy doesn't do what it claims in these regards qualifies as attacking it, unless critique = attack. Further, finding KA lacking in the types of questions it asks students doesn't require offering a better alternative in order for the critique to be valid.

The rest of your comment is probably not that controversial, but these aspects of KA are not what Meyer was evaluating. Special pleading doesn't give Kahn Academy credit for the claims they make. I'm sure they will continue to improve--as the 800lb gorilla in the room, they have plenty of attention from people who can offer suggestions. The Common Core requires students to think more deeply about the mathematics than most of the state standards that came before it, and the types of questions that KA asks its students are too superficial.
China's GDP May Be Up to 10 Percent Bigger Than Thought
He should pay bounties in BTC...
Some of the css is sorta wonky, and moving the map causes it to be cut-off at weird places.

My recommendation is to use calc along with vh:

.map-application {
height: 100vh;
}

#map {
height: calc(100% - 13em); //100% - height of .info-bar
}
The Builderberg Group, CFR, TC, RIIA, Club of Rome and the Round Table care 0% if banks are documented. This is nice in theory but there's a reason why no one has been able to do much of anything about this for years now.

The banking industry won't be "disrupted" until the financial system collapses.
People don't grasp exponential growth[1]. That pattern will be useful for a very short time, and then you are wrong again.

And then, when you finally accept that you don't grasp it and start calculating with a formal growth rate, the growth rate suddenly changes.

[1] Nobody does. Some people know they don't, some are completely naive, the others lie to themselves. The first group have a chance of dealing correctly with it.
Our son was delivered at a hospital by a midwife that was part of a team of 2 midwives (CPNP/CNM) and 2 doctors (OB/GYN). If things got beyond her capability she could call in the doctors for backup. Our daughter was delivered by one of the doctors due to him being on call.

So, nurse midwifes do deliver in hospitals. I actually think they are not allowed to do home births or they can lose their license.

(In the US)
with subtitles available for so many tv shows in multiple languages online I have always wondered if google bot scans and adds those translations in its algorithms for google translate.
As most are done by dual language speakers they are a great open source resource of translated languages.
Imposter Syndrome? Or Just a Screwed Up Culture?
Curious to see whether this system is robust enough for unpredictable outdoor breezes.
FWIW, I did dash something off and submit it: https://news.ycombinator.com/item?id=8755549

Logging off now. Later folks.
That's a good point. Our son was delivered by a midwife but due to his size (10 pounds) the OB/GYN came in after to repair the damage caused by delivery. I'm more that a little grateful for that. :O
I had the same thought. If it's meant to look cartoony it might be better to just deform a simple box/balloon and map that to the sprite. This is worthy work, I just think it's a little too realistic for the whimsical context and ends up failing to satisfy either criterion.
The news about better treatment for drug-resistant tuberculosis is huge. If confirmed, that'll be the basis for saving many lives in the next decade, especially in India. Multiple-drug-resistant tuberculosis has been an alarming problem there.[1]

[1] http://articles.economictimes.indiatimes.com/2013-06-23/news...

http://www.wsj.com/news/articles/SB1000142405270230344420457...

http://www.iom.edu/Reports/2012/Facing-the-Reality-of-Drug-R...
With eMMC you can have an 8-bit data bus (instead of 4) and higher clock speed.
If it's running in a shader, which it is, it should work just fine via GLSL and WebGL
The mechanical solutions are always really interesting and clever, but digital systems are much more flexible.

Really cool video on the mechanical ignition timing control in a delorean to control emissions. Explanation of ignition advance at the end: https://www.youtube.com/watch?v=ge1GwepqtK0
'The thing is that your solution is the algebraic solution'

I agree. That's why I said

'Really, the trick mention(ed) ... is just a rephrasing of the algebra'

Just because you do number juggling in your head rather than write it formulaically doesn't make it an inferior technique, or make it not algebra, which was my point.
I'm pretty sure the correct translation of Aderendhülse is "insulated wire ferrules".
I created http://www.websequencediagrams.com. PlantUML came several years later. I'm happy that my syntax is good enough to emulate in so many different projects.
I've already confused it with the libre PBX / telephony project http://www.asterisk.org/
The difference between you and me is that I've seen enough different notions of object (and defined some of my own) that I don't believe there is any such definition. In class I discuss why, but it's difficult to transcribe such an interactive discussion; but it is essentially the other side of "this conversation again, and again, and again".

I don't find your definition particularly useful, either: it's too encompassing to really be of much use _to me_. By this definition just about all computation is an "object", which doesn't really tell me anything interesting.

Also, as a general pedagogic principle, I'm opposed to definitions that are too vague to say much to a middle-of-the-pack undergraduate. I'd definitely put your definition of objects in that space. It sounds like good stuff—it's certainly "quotable"—but the typical student would be hard-pressed to actually explain it or put it to use.
1m square deskspace requirements and fast tooling in software, rather than thousands of pounds and new metal every time you want to change a detail.

Injection moulding is only lower cost when you want to buy something that is already mass manufactured or millions of identical things. Up to about 10,000 units, 3d printing is cheaper.
> In general, once I learned the reality of salt (eg there is no reason to limit consumption)…

This caught my attention because I may have mild hypertension and am starting to be more conscious of my diet. Would you happen to have a source that I could start from?
I agree. This would be great in a WebGL implementation.
This is surprisingly similar to the story of home computers in Brazil.

From 1984 (during which time we were under a military dictatorship) to 1991, we were under a market reserve. Because of this, the computers we had were either cloned from smuggled devices, or, funnily enough, devices imported legally with the intention of being reverse engineered.

Reverse engineering was not only legal, it was encouraged by the reserve. Due to government incentives, even companies that had nothing to do with computers ended up building them.

Cloned computers ranged from ZX81 and Apple II+, to ones with more elaborate circuitry, such as the Mac 512 (this one has a lot of interesting stories -- albeit somewhat sad, in a sense --, some even involves orange juice embargo from the US government).

The idea behind the reserve was to create a computer hardware industry in Brazil, but this ended up never happening the way it was supposed to happen.

Although locally-developed peripherals were made, there were very few computers that were actually designed in Brazil that ended up having a significant portion of the market. Clones thrived, mostly. Local semiconductor companies failed to produce quality components, but those were used anyway. Some companies managed to import (with special permission from the government) processors and other components we were never able to properly manufacture.

In a move that's both obvious and surprising, the focus moved to software when the reserve was finally lifted.

Obvious because, although we had many skilled people that managed to reverse engineer circuits (including ASICs, as was the case with the Unitron Mac), and build new ones, often improving them (either making them faster, more reliable, or just cheaper), we still depended on foreign technology to build our computers. The whole idea of the reserve was to reduce that dependency.

Surprising because, during the reserve, software was most often hacked versions of foreign stuff. Although some important bits and pieces (such as compilers, operating systems, CAD programs, word processing and a bunch of other stuff) ended up being made locally, unless you're a collector, you're not going to find the remnants of these bits.
Use this on the linux source code
this is awesome on so many levels. but a spaceship is the worst example! :) something organic would awe much more... well it does have more organic examples at the end.
Indeed, here is her take on the report referenced in the NY Times article that is the OP:

http://www.skepticalob.com/2014/12/new-uk-homebirth-guidelin...

Clearly she has virtually the opposite perspective from the one in the NYT, and one that seems hard to dismiss.

(My kid was delivered in a hospital, and I tell myself that I'm being impartial, but who knows.)
Is the filename of "coqasm.pdf" also trying to get at something?
This is the commitment and consistency effect.

The extreme cases can be found in cults where followers cling tighter to their beliefs once exposed.

A great example are the followers of Harold Camping, the Christian radio broadcaster who predicted the end of the world a few years ago, and kept re-predicting when it never came.

http://en.wikipedia.org/wiki/Harold_Camping
I've used an app called Air Display to do the same thing for quite a while, but instead of USB it connects over WiFi - which is convenient, but the refresh rate is slow. I used it mainly to have my chat client on a 3rd screen.
The Mystery of Tufte’s Stem-and-Leaf Plot
FYI: Apparently NIPS abbreviates
Neural Information Processing Systems.
Sure it would work. It only needs a variable clutch on a standard engine and the motion on the blades is very slight and mostly balanced, so the torque difference should be pretty manageable.
I own a Sansaire too and have heard a lot of good things about the Anova... have you had experience with both? Would you recommend the Anova as an upgrade from the Sansaire?
This is flawed logic arising from the idiosyncrasies of the Human Experience.

Technically though, when someone takes an MRI of your brain, that means your consciousness is being observed.
While you make a good point (that one always needs to ensure the facts they know/take for granted are correct and haven't changed), it doesn't seem that is what he is referring to.

The need to reread and reconsider books, ideas, etc. is not to check if the facts have changed, but to make sure you didn't miss a point because of lack of knowledge or bias.

For example (on a very basic level), I find that if I reread a book on a programming language after using it for some time I notice things which I missed on a previous reading or wasn't able to appreciate due to lack of familiarity with the language. The same can apply to history - or any other study - where one only appreciates certain details after understanding the larger picture and surrounding events.

For this reason there lies an advantage in both rereading the same book (immediately or after some time) by itself and reading after studying more on the topic from other sources.
Pair Programming with Git: A Workflow for Humans
> it restricts lab B from ever thinking that way

Is it not possible to look at existing patents and build on them, filing new patents which build on the existing ones? What would really restrict lab B from ever thinking that way would be if lab A never filed a patent, and just kept the discovery locked up as a trade secret.
The joints looked like simple pivots, not flex joints. See how the blade is attached at a 45 degree angle? I think it just pivots there.
Thanks for the write-up, this looks awesome!
See https://en.wikipedia.org/wiki/Home_birth#United_States

for a bit of insight into the US legal situation.
Compare original vs BPG in the soccer picture, then look at the green strip on the shirt of the red team player and slide over it. It's magical how perfectly the compresion make the red dots disappear.
Last week China passed the U.S. as the world's largest economy, by at least one measure: http://www.marketwatch.com/story/its-official-america-is-now...

It's just staggering how quickly they're growing. China used more concrete in 3 years than the U.S. used in the entire 20th century.

http://www.forbes.com/sites/niallmccarthy/2014/12/05/china-u...
It's fantastic to see articles that focus on the positives. Most media and the press are all about the daily, the shocking and the hurtful. This is good news.
Cached confirmation bias
You can use an electric motor. We can easily make extremely high power electric motors (see: CNC machines and Diesel trains), and power storage will continue to improve.

The added cost of batteries at even today's prices could be worth it for the decreased mechanical complexity of the rest.

If all we need to do is change the torque of an electric motor, that can be done essentially instantaneously even at high power levels.
previously: https://news.ycombinator.com/item?id=8735572

BPG context: https://news.ycombinator.com/item?id=8704629
> For lots of people, speed is much more important. Machines don't crash every ten minutes.

Even if they do, it is often faster and more reliable to recover from the RAM of a surviving node than to try to recover from the disk on the crashed system.

> lets say that it takes a full day to rebuild the MDBM

I can't imagine a circumstance where it'd take even an hour to rebuild an MDBM from raw data.
You're not worried about speeding up the blades, just changing the torque on the drive system. The inertia of the blades actually helps you here.
>First, you can simulate overtones by where you strike a guitar.

If you know the make of the guitar and the strings and where it was picked each time and the location of each of the tone and volume knobs and the position of the pickup switches.

>Tube amps do some really funky mixing, which can exasperate FFTs by giving weird/wrong results.

>unknown non-linear effects...distortion
The parts will cycle back and forth exactly as much as they would in a traditional helicopter, and there are fewer comparatively small parts. It would likely be stronger and more fatigue resistant than current methods of controlling blade pitch. We can program the motor to change torque as smoothly as we want.
> You wouldn't see people cracking open beers at 2:00 on a "Summer Friday" in a New York shop.

And cracking beers at 2:00pm doesn't mean much if you are coding all day from home on Saturday, if you ask me.
No, but maybe something in another field (like applied Math or Science) and you might find yourself in a position to be doing something meaningful/valuable.
I believe parent meant that position doesn't change size. It may be faster, but one way or another the pain does come from pushing the baby out and potentially making lots of damage to someone's crotch in the process.
Is there any scientific evidence for this statement on no harmful chemical transfer below 140F. Also, just because the food came in the very bag you're cooking it in doesn't mean it is safer.
> It requires the discoverer of the refinement to obtain the permission of Lab A before they can make any money

Not necessarily; they (lab B) can license the refinement to whoever they want, for example lab A. Or to a third party who licenses both technologies.
Lies, Damn Lies and Podcasts
And that makes it safer?
Got to disagree with you on this one Scott :) It's a simple matter of light-hours. Folks spend a lot more time in their office than walking between them. The light streaming in through those big beautiful windows is wasted on a mostly empty hallway!