skysight-inc/HackerNews huggingface dataset:
There is No Silver Bullet like “Rush code to live”
ESA did a review of Skylon and the Sabre engine and said "...the SKYLON vehicle can be realised given today's current technology and successful engine development."

http://www.reactionengines.co.uk/space_skylon.html

Of course, there needs to be a successful engine development project. Which needs another billion or two to complete according to the CEO/MD of Reaction Engine. (He was a bit more specific than that when I heard him say it, but it is in the ballpark.)
The great thing about markdown is that it's basically readable as plain text.

So you get something that's easy to write, works with plain text formatting, and can be viewed with full HTML styling.
Cool, how about 2 or more people listening to the same audio in sync on their different Internet devices, Spotify?

Together creating a stereo system with friends & or those in the crowd around them.

Anyone else interested in such a feature?
Feynman [1]: "Let us show you something interesting that we have recently discovered: All
of the laws of physics can be contained in one equation. That equation is

U = 0.

What a simple equation! Of course, it is necessary to know what the symbol means.
U is a physical quantity which we will call the “unworldliness” of the situation.
And we have a formula for it. Here is how you calculate the unworldliness. You
take all of the known physical laws and write them in a special form. For example,
suppose you take the law of mechanics, F = ma , and rewrite it as F − ma = 0.
Then you can call (F − ma) — which should, of course, be zero — the “mismatch”
of mechanics. Next, you take the square of this mismatch and call it U_1 , which
can be called the “unworldliness of mechanical eﬀects.” In other words, you take
U_1 = (F − ma)^2.

[...]

You continue to write U_3 , U_4 , and so on—one for every physical law there is.
Finally you call the total unworldliness U of the world the sum of the various
unworldlinesses U_i from all the subphenomena that are involved; that is, U = SUM (U_i).
Then the great “law of nature” is

U = 0. (25.32)

This “law” means, of course, that the sum of the squares of all the individual
mismatches is zero, and the only way the sum of a lot of squares can be zero is
for each one of the terms to be zero.

So the “beautifully simple” law in Eq. (25.32) is equivalent to the whole
series of equations that you originally wrote down. It is therefore absolutely
obvious that a simple notation that just hides the complexity in the definitions
of symbols is not real simplicity. It is just a trick . The beauty that appears in
Eq. (25.32)—just from the fact that several equations are hidden within it—is
no more than a trick. When you unwrap the whole thing, you get back where
you were before."

[1] Feynman R, Leighton R, and Sands M. The Feynman Lectures on Physics. Volume 2, chapter 25, page 10.
Where did the idea for the API come from? At large companies that like I imagine upper-management sees things like this as a cost center, which can make it difficult to try and innovate.
Releasing a vendor lock in focused system is an act of self interest.

Releasing something for the public good, open source, open for all to use is an entirely different, more applaudable action.

You don't get browny points for being baiting your traps. Even if it's fancy cheese.
See my comment above.

Actually, there is one way that Microsoft did become the new IBM. Long ago, I went to a talk by a senior IBMer and he said "We used to be the Evil Empire. Somebody else has that job now."
Spotify doesn't offer this? I thought they did?

If not +1.
This comes out at a time when I've finally decided to start digging into ElasticSearch. Since it's a side project, I don't have to worry about scaling and management issues. So just from the standpoint of functionalities, is there any advantage of this Search as a Service over an ElasticSearch cluster on Azure's Virtual Machines?
Concorde reportedly made BA about £750M.

I'm not sure whether that figure takes into account the development costs - but the reason that it was retired was due to Airbus withdrawing support.

http://www.concordesst.com/retire/faq_r.html
They can all be provided to varying degrees. But usually most distributed systems sacrifice some availability to guarantee consistency (i.e avoid data loss at all costs)
Well, the article clearly states that Reaction Engines is a rocket company, so it follows that OP must have not read the article very carefully, if at all.
Nope. Nix is the best.
Super stoked to see a public api from your company. First thing I did, though, was try to hit http://api.remix.bestbuy.com/v1/products/1162032.json. Despite being a json file, it returns html. Admittedly, a consumer should be looking at the err code first, but a json formatted error would be preffered :]

keep up the great work!
Agreed; the '500 remain' number seems to be most applicable to the beginning of the 20th century, which isn't really '70 years' from any historical milestone. (Google "500 buffalo remained", with quotes).
From what I've seen iOS 7 runs pretty well on the 4S.
Why do you assume intercontinental flight will use the same configuration as the orbiter? First of all, the orbiter still needs lots of oxygen on board, even though they can save around half of it with their hybrid jet/rocket engine. Furthermore it needs heavy heatshields. Both things that are not needed (or to a much lesser extent) in an intercontinental craft. The saved weight for oxygen alone should allow you to go from 30 to 200 passengers, giving you another order of magnitude - and suddenly you're at first class ticket prices.
A "theory of everything" posted on the non-peer-reviewed arXiv? Color me skeptical.
I'd say RethinkDB does it best. You just chain some regular function calls and pass some lambdas here and there. It looks and feels very natural. Plus, that "data explorer" thing lets you test those queries quickly.

Generating a list of all used tags:

r.table('posts')('tags').reduce((a, b) => a.setUnion(b))

Grabbing all posts with the 'foo' tag:

r.table('posts').filter((doc) => doc('tags').contains('foo'))
What's the formula for choosing Top Trending? Is it absolute or relative lift over the previous three hours? Can you disclose any details on the algorithms or the features used in the Similar Products API?

I'd love to talk to you offline. Could you shoot me an email? Details in profile.
While you see yourself as objecting to Markdown, I see you as objecting to other templating languages. For example, a PHP file can do what you are doing, but it will have the full feature set of PHP available and it doesn't necessarily have a great API for working with a DOM. You could say the same of something like Apache Velocity.

Of course, there are a lot of template languages out there: http://en.wikipedia.org/wiki/Comparison_of_web_template_engi... and I don't know how yours compares to the best of them, but the problem you're tackling is different from the problem that Markdown is tackling.

Let's not forget all the static site generators: http://staticsitegenerators.net/

The main strengths of Markdown are simplicity, readability, and standard feature set. Markdown is entirely usable without being transformed into HTML. Plus, the lack of extensibility means that services like GitHub can enable pretty views of Markdown documents without having to process costly and/or dangerous user-provided extensions. Once you introduce variables and calculations and lookups into a DOM, you largely lose all that and you have something entirely different.
To go higher with tons of weight requires even more fuel. This is a _very_ common rocket science problem and is the reason why almost all space vehicles have stages that drop off.

To go high, you need more fuel, to get more fuel up you need more fuel... etc etc.

"we just go higher with less air resistance" is a bullshit marketing thing and not really showing the math.

Engines designed to be supersonic are also _very_ shitty at subsonic speeds. Sure, cooling 1000 degree air for use in a turbo fan is great. You're not gonna get _any_ benefit doing it at ground level.
I likewise find the "harmony with nature" idea to be laughable, but for a very different reason. If "nature" has any meaning at all, then we are part of it. Other animals are perfectly happy to change their situation to their benefit. Beavers, for example, can create lakes by choking off rivers. Are they living "in harmony" with nature? That feels like a strange question to me, and so I wonder why it shouldn't feel like a strange question when the beavers are replaced by humans.
meh, insulated cabin. No big deal. just shitloads more weight and/or space (nasa aero gels would probably be great here).

Aka this thing is never going to see commercial flight.
Yea, that's basically what I suggested; I called it taxes.
Eight Years of College Lets Finns Hide from Labor Market
There was a prototype salt power plant in Norway that eventually was abandoned:

http://en.wikipedia.org/wiki/Statkraft_osmotic_power_prototy...

The competition in energy generation is fierce.

For those wondering how this works, basically when you have two liquids with different salt concentrations separated by a semipermeable membrane, the liquid with the lowest concentration tends to get pulled into the one with the higher concentration - this builds up a pressure difference that can be used to drive a turbine.

Interestingly, the same thing happens in living organisms - saltwater fish loose water to the sea so they would dehydrate if it weren't for special precautions, while freshwater fish have the opposite problem, they would end up too diluted if their body didn't have means of getting rid of the excess water.
Just ran across this response. Forgot I even commented on this.

That's sort of the point to me. Tech always gets cheaper, people usually don't. If you're wealthy enough to buy a $20,000 rifle for fun (I'm assuming the kind of person that can buy a $20,000 rifle probably doesn't need it) then the time spent to learn to consistently hit the shots might be worth more than the money you spend on the rifle.

Other than that, "This x doesn't accomplish anything that a well-trained human can't accomplish" could have been and likely was said about almost any technology that's existed. In a similar somewhat less historically accurate vein, I'm reminded of John Henry.
Stackoverflow mostly. w3schools (yeah I'll admit it!) when I'm stuck on some tricky css or something.
That's the wrong message to send society and unfairly punishes those who go out of their way to conform to rules they don't agree with.
CouchDB doesn't support ad hoc queries. CouchDB is all about MapReduce and heavy caching. It's very rigid.
Very cool features, thanks!
Sorry, instead of "native compilation" I actually should have said "compiles to a single static binary".
If it were somewhere else I'd have considered that, but considering how widely recognised the problem of antibiotics overuse in China is I considered that more likely.

"At medical institutions about 70 percent of hospitalized patients have antibiotics prescribed by doctors but nearly 80 percent of those prescriptions are unnecessary, Yang (director of the behavioral medicine branch of the Chinese Medical Association) noted."[1]

"Each year on the mainland about 200,000 people die from adverse drug events and 40 percent of the deaths are related to the abuse of antibiotics, Yang told the Beijing-based Health News."

1. http://usa.chinadaily.com.cn/epaper/2011-01/05/content_11798...
I'd take issue with the title. The last thing you want to do is "rush" your development process. The author references Brooks' No Silver Bullet but perhaps missed Refired, where Brooks quotes Glass:

...it is time for the practitioner to examine evolutionary improvements rather than to wait--or hope--for revolutionary ones.

The "organic growth model" the author refers to is indeed the evolutionary improvement Brooks spoke of forty years ago. Revolutionary, indeed.
the thermodynamic economics of ram/scram jets at the Mach5+ speeds is almost killed compare to the rocket engines by the fact that oxygen is only 20% of the incoming air, while the whole incoming air needs to be processed through the engine, ie. compressed/(may be cooled interstage)/heated/expelled. Various unavoidable losses on this 80% (nitrogen) of the incoming air eat deeply into end-result efficiency of such engine when compared to a rocket engine.
Thanks, yeah I can see how this is more like hosted mongoDB - and I've seen dynode on npm, nice work!
I recall seeing it myself, anyway. "Powered by Google". May not have lasted long.
I'm not a Haskell purist, but this isn't really dispatch on return type, this is manual inspection of manually provided metadata that just happens, in this case, to be (intended to be) a return type.

The return type isn't enforced, incidentally:

user> (defn ^String my-function [^Integer foo] (apply concat (repeat foo "x")))
#'user/my-function
user> (my-function 3)
(\x \x \x)

Whoops, I meant (apply str ...).

You also can't use the metadata on a function introduced by (defn ^ReturnType ...) in more or less any useful way, if you don't have a reference to the var itself. If you pass it to a function, you basically can't recover it:

user> (defn do-something-interesting-with-return-type [f] (println "here's my metadata:" (meta f)))
#'user/do-something-interesting-with-return-type
user> (do-something-interesting-with-return-type my-function)
here's my metadata: nil
nil

Gone!

You can tell that something fishy is going on in the SO answer because the author has to pass in the function by name, #'return-string.
Do you think in theory that it is possible to create a flat file based system that is multi-thread/multiuser safe?

My somewhat ignorant inclination is to suggest that maildir fits this description.
The trick is, and it is a trick, to "instantly cool the air". Think about that for a moment. Generally the way most 'air breathing' engines work is that they take air, heat it (which expands it (thanks Boyle!)) and toss it backwards which imparts a forced in the forward direction (thanks Newton!). The difference in temperature between the inlet and exhaust temperature of a jet engine is a component of its efficiency. (see http://en.wikipedia.org/wiki/Jet_engine#Energy_efficiency for some math :-)

But basically if you're suddenly cooling air it gets smaller, which creates a lower pressure, and was used effectively in steam pumps to create the vacuum needed to lift water out of mines.

So the Reaction Engines concept takes really hot air that is compressed because it is being pushed out of the way by the air frame, then super cools it which causes it to become much smaller, and then dumps that into the engine. Which then heats it up again and pushed out.

If I understand the theory correctly, it takes heat from the air, removes it and puts it into liquid hydrogen (which then becomes vaporous(sp?) hydrogen) and then burns that hydrogen with residual oxygen to put the heat back into the air plus what ever is extra from the hydrogen. What bugs me about it is that it seems to double count the energy in the air rather than single count it. But I'm interested in seeing one of their machines in action. If someone knows whether or not there is a violation of thermodynamics in there I'd like to understand that.

That said a mach 5 vehicle with a range of 12,000 miles and a payload capacity of 15 tons has much more interesting uses than carrying passengers I think. Would make a heck of a cruise missile.
Show HN: Hamwerk, a hyper-specialized to-do list for homework
I'd assuming pricing will be similar and incredibly competitive... and thanks, didn't realize how limited dynamoDB was
That's why they're all squared.

Which is, of course, assuming that none of the equations involve imaginary numbers.
I think the most important thing is to compare with other known dbs on the same hardware, though.
There is hardly any reason these days to use 2.7 over 3.x for any greenfield project. You would have to be really really sure a non ported package was absolutely vital.

That said there is a considerable number of commercial companies who are on 2.x and staying there for the foreseeable (as in "yes we really should move but ...)

I divide these into three camps

- the distribution has 2.x. Some people are still on Ubuntu 12.04 or 10.04 and not planning a move because there is not enough sysadmin resources.

- 2to3 lite: we could move but we have not bothered yet, but 2to3 will auto correct everything anyway.

- we genuinely have too much built on old libraries and old infrastructure that the move to 3 is actually slightly scary

The first one is lack of technical leadership, the second is similar but actually solvable and the third is rare (but I can name a couple of mega corps with that problem)

My suggestion - start on 3.4, building your project on top of it, focus on good Unicode practises anyway and if you find a library that must must must be used and is 2.x only - set it up as a micro service and use it that way :-)
C# Gets the Safe Navigation Operator (Person?.Address?.Street)
If you switch tabs it also plays the current tracker for longer. Not sure if this is a feature or not, haven't delved in to it.
"Next, you take the square of this mismatch and call it U_1"

Each U_i is a square, so it's a sum on non-negative quantities that equals zero so that each U_i = 0 must hold separately.
That's the cool trick :)
BitSharesX Zooming Up the Charts to #4 in the World
That is what the squaring is for, I figure. To make all the terms non-negative.

(now, if some of the unreal-ness components were complex, there would be a problem there, but eh)
minBound and maxBound are typeclass functions. Typeclass's are a similar to java interfaces.

So the Bounded typeclass is defined as

class Bounded a where
minBound :: a
maxBound :: a

If you have a function and you want the argument to be Bounded you write

allLessThan :: (Enum a, Bounded a)=> a -> [a]
allLessThan x = [minBound..x]

Here `a` is a generic type. That implements the Enum and Bounded typeclass. You could just write `allLessThan x = [minBound..x]` and Haskell with infer the type classes by itself.

To implement the typeclass you use `instance`, like so:

data MyType = A | B | C | D
instance Bounded MyType where
minBound = A
maxBound = D
npm already does this from any git repo. I have no idea why anyone would want to tie themselves to github only.
My personal experience with paid fully online course was for a 1 year program in micro systems development/design. It was pretty steep at the time, several thousand, but the benefit was the awesome professor. He and his assistants read every line of code, ran every assignment, and gave fully detailed explanations to the score and gave constructive criticisms. Afterwards, they continued to be helpful even after the course.

As for full curricilums... I can't stand curriculums. It's like going to a buffet to eat some shrimp, lettuce, a slice of roast beef, some smashed potatas except they stack a bunch of other meals on top of it.
"NULL" comes between person down/injury and robbery.
Scaling Up Your Venture Without Screwing Up: Free Five-Week Course
But I think the original commenter was commenting on the feasibility of the original article, which goes down to the minimum limit.
A colleague of mine also experimented with ElasticSearch on Azure. His server got hacked and was shut down by Microsoft after they discovered it generated large amounts of traffic and participated in DOS attacks. (there was a vulnerabiliy, and many ElasticSearch servers were hacked a few months back)

So I'd argue that using Azure Search Service, being managed, will free you from worries of having to manage and update yet another technology.
Yeah. I enjoy shooting, but I don't know a ton about competition shooting. I'm just talking about the kind of stuff you'd find labeled as "match" in a store. Any shooting I do is for kicks with a pistol at fifty feet.

I'm more interested in the application of learning algorithms and how useful they would or wouldn't be in being able to get a somewhat optimum statistical pattern out of them (optimum within the tolerances of the particular loads quality). Basically, what's the maximum accuracy you could get out of standard off-the-shelf ammo if your rifle could self-adjust, is a question I'd be interested in looking into.

If you've got any particularly relevant links on the various types of ammunition you'd use for competition, I'd be interested in reading them, though.
I implemented marching cubes in the 00's to extract isosurface meshes from PET scans. As far as I can remember I had it operating real-time on regular CPUs. The volumes were in the order of 512^3 if my memory serves me well. I guess GPUs could help for very large volumes though.
You need some way to keep the passengers from being roasted alive, and you need to engineer it to commercial air safety standards (redundant systems, emergency exits, little sign that says 'no smoking'). By the end of the process you'll be pining for the days of having to just lug around a little oxygen.
Gif and Tell
Polio: Mutated virus breaches vaccine protection
It is absurd that for every programming language there must be a new package manager. rubygems, pip, CPAN, composer, npm, bower, etc. I highly recommend that folks look into what GNU Guix and Nix can do, because they are capable of being decentralized package management systems for any type of software. They both feature "profiles", which you could equate with bundles, gemsets, whatever they are called for your language. It's trivial to use multiple versions of the same package (let's say Ruby 1.9.3 and 2.0) for different projects without them conflicting. These software projects are relatively new, but keep your eye on them and give them a shot if you have a chance.

GNU Guix homepage: https://gnu.org/software/guix/

Nix homepage: http://nixos.org/
What you're looking for is called an HSM.
The notion of "nature in balance" is selection bias. There are certainly places where nature is not sustainable and balanced. Look for example at what happens with the introduction of invasive species (which may happen these days because of humans, but I imagine the opening of the Bering's Strait land bridge would have lead to a similar disruption.) Pre-human nature only appeared balanced because it had had a long time to equilibrate, not because of some innate quality.
Let's hypothetically say I'm a small business owner who doesn't get paid unless I put in the work, but I'm simultaneously a multi-millionaire putting away $500k/year because I work so much. Do you think a judge looking at my financial statements would agree that I have an economic hardship?

On the other hand, let's look at somebody working a salaried position who gets paid the same either way, whether he goes to work or serves on a jury. That's great for him, except he's also my employee, and now my (small) business takes the hit in identical expenses with less productivity.

I've heard the trick about jury nullification, and I would probably pull that card if I ever actually got into the courtroom, but I shouldn't need to go through all that effort, and what about the people who don't know about it?

It's been said that the only people serving on the jury are people who can't figure out how to get out of it. Having successfully gotten out of it twice with little to no effort, I don't believe that's true. Rather, I think the people serving on the jury are those who have nowhere else better to be. I don't mean to be immodest, but I think I'm a bright person, and I think that I would be a constructive addition to jury, but I and people like me just have better things to do.
I've been tracking my time, finances, health etc. for a little while. Wrote a blog post about the benefits of 'personal analytics' earlier this year: http://www.nilkanth.com/2014/04/11/will-you-take-100-now-or-...