skysight-inc/HackerNews huggingface dataset:
The block being hashed will include the payout address set by the miner, which will make the block he is working on different than the ones the others are working on.

The block includes a nonce, a random number which is changed for each try until one gives a hash < target. That nonce is picked at random independently by the miners, so that also makes the blocks they are working on different.
see also http://www.xanadu.com/ / http://en.wikipedia.org/wiki/Project_Xanadu
Oh I'll be watching it. Just not on HBO.
reminds of the ol' Web Trend Map http://cloudfront4.ia.net/wp-content/uploads/2009/07/wtm4-fi...
How do your servers talk to you?
I just started learning about high frequency trading. I was interested to learn about some of the lore surrounding the field. While digital algorithms are relatively new, trading algorithms, in a conceptual sense, have existed for at least hundreds of years. I don't usually throw around links to my own content, but I think this is relevant: http://codyromano.com/using-pigeons-as-algorithms/
don't forget dropouts at harvard have been doing pretty well : > (i.e., mark and bill)
Erlang Factory 2014 – That's 'Billion' with a 'B': Scaling at WhatsApp
A couple of years ago, a doctor brought the ~2300mg of sodium recommendation to my attention. While I had previously been considering foods based on calories, fat, etc., I had never even thought about the sodium level, nor how much I was getting or should be getting.

So I started paying attention. I was amazed at how easily you could fly way past 2300mg while still eating healthy otherwise. I began reducing my sodium intake on purpose, choosing low-salt or no-salt options when available, and cooking with less or no salt. (It's not always easy to find low-salt packaged foods! Some things I just stopped eating altogether, or eat very little of.)

It was initially an exercise in blandness, but now I'm quite used to the flavor, and am disgusted at the idea of eating as much salt as I did 2+ years ago.
I don't think the military ever really lost control. When the brotherhood stepped wrong, they were outa der.
> Grails. After two months of work i must say i found it very interesting and productive

Two months isn't long enough to gauge productivity - there could be a lot of maintenance issues later.

I'm interested to know how many of the Groovy Language features are used in a typical Grails project, or in any Grails project for that matter. I mean, does any Grails project out there, say, transform the abstract syntax tree with Groovy's AST transforms?
Just use simple_form my friend!

= simple_form_for @user, html: { class: 'form-horizontal' } do |f|
= f.error_notification

.form-inputs
= f.input :username, label: "Enter your username:", required: true
= f.input :password, label: "Enter your password.", required: true

.form-actions
= f.button :submit, "Save Changes", class: 'btn btn-primary'

Note though that this is a huge benefit of using simple_form _in addition_ to Slim.
You mention garbage collection, this is actually an interesting job for those that do it in Reading, UK. Reading has had the benefit of 'negative unemployment', as in more jobs than people, so how do you recruit people to collect the garbage?

It actually works out well for some that do it, by starting at '4 a.m.' they finish early afternoon, around about lunch time and can be around when their kids get out of school. They also get paid rather well, as in £40K, which is well above minimum wage. They are also working, whereas chances are that 'Microsoft', 'Vodafone' or any of the other big-brand, knowledge economy employers of the area probably would not employ them. The garbage collector in Reading is quite likely to want to hold onto his/her job as it makes a lot of life possible, even if it does come with the 'stigma' of being in the 'recycling business' (okay, being a bin man!).

I must say that the situation in Reading is an anomaly, it may not even exist any more, but five years ago it was a cushy number, I had friends doing it.

Compare this situation to collecting the garbage in a rural no-jobs area. Here the job pays minimum wage and nobody sticks at it for very long. There is no benefit in doing it as the money is barely any more than income support and any overtime is swallowed up by tax. Consequently there is a high amount of churn as people give it a go to get off the employment register and prove to the government that they are willing to work, then, one way or another, they jack it in.

So how would that work out in a 'basic income' economy in some rural town where there are no jobs? I think it would still work out rather well, even if the pay was £10K after tax + Basic Income. It would make the difference between having a subsistence style existence and one where one could cook nice meals for the kids and buy them all the things they need. Even a holiday could be afforded, subject to budgeting ability.
Author would benefit from a closer reading of the M. Lewis piece. It's well researched far from trivial. What's interesting about it is that it tells the story of how outsiders modeled the various ways to rip off <institutional> traders. They did this first and the empirically pattern-matched observed behaviour. They then did both physical and social market-micro-structure studies.

Lets take a look at this section (From attached article):

The fact of the matter is that HFT’s can’t rip you off. You are never under any obligation to do business with them. In spite of that, lots of sophisticated investors voluntarily pay HFTs every day. An important question for all the critics of HFT to grapple with is, “why do sophisticated investors voluntarily pay for something useless?”

This comes right after the section on why people don't adopt obvious strategies (use limit orders, etc):

Why doesn’t everyone do this?

This is an obvious question to ask. The answer is, quite simply, execution risk. Execution risk is the risk that you place an order but your trade never actually happens.

The Analysis Lewis outlines in his book shows that HFT is specificially engineered <to create execution risk>. It engineers artificial scarcity (the opposite of liquidity). Empirical study from Lewis's book:

Finally [The Trader] complained so loudly that they sent the developers, the guys who came to RBC in the Carlin acquisition. “They told me it was because I was in New York and the markets were in New Jersey and my market data was slow,” Katsuyama says. “Then they said that it was all caused by the fact that there are thousands of people trading in the market. They’d say: ‘You aren’t the only one trying to do what you’re trying to do. There’s other events. There’s news.’ ”
<If that was the case, he asked them, why did the market in any given stock dry up only when he was trying to trade in it?> [emphasis added] To make his point, he asked the developers to stand behind him and watch while he traded. “I’d say: ‘Watch closely. I am about to buy 100,000 shares of AMD. I am willing to pay $15 a share. There are currently 100,000 shares of AMD being offered at $15 a share — 10,000 on BATS, 35,000 on the New York Stock Exchange, 30,000 on Nasdaq and 25,000 on Direct Edge.’ You could see it all on the screens. We’d all sit there and stare at the screen, and I’d have my finger over the Enter button. I’d count out loud to five. . . .
“ ‘One. . . .
“ ‘Two. . . . See, nothing’s happened.
“ ‘Three. . . . Offers are still there at 15. . . .
“ ‘Four. . . . Still no movement. . . .
“ ‘Five.’ Then I’d hit the Enter button, and — boom! — all hell would break loose. The offerings would all disappear, and the stock would pop higher.”

This is why it's being investigated by the FBI, in addition the other issues (front running, NPI, etc).

"There are many people in government who are very focused on this and who are concerned about it and who think it breaks the law," an FBI spokesman said. "There is a big concern that high-frequency traders are getting material nonpublic information ahead of others and trading on it."
I found systemd has a really good API tbh. What are your issues with it?
really? :D i have been wondering about that (still haven't checked any of the videos).

If so, am definitely getting a win phone next!
Will the PIL import pick up WebP images as long as libwebp-dev is installed? I'm a WebP kinda guy and I love fuzzy math achievements like this, especially when I don't have to switch to Windows[1] to take advantage of it.

[1] http://www.visipics.info
I am not a finance expert. What would happen if you traded stocks using a continual series of discrete uniform price auctions?

Each buyer enters a sealed bid consisting of the amount he wishes to buy, and at what price. Each seller enters a sealed offer consisting of the amount he wishes to sell, and at what price.

When the auction interval ends, the secure settlement system orders the bids and offers, and calculates the common settlement price such that every bid higher than that price can be satisfied with the offers lower than that price. Every unit in the auction is traded at that one price. Unsatisfied bids and offers could be set up to roll over to subsequent intervals, or to expire.

The settlement system takes a fee from all trades, as a fraction of the amount a buyer was willing to pay, but didn't need to, and a fraction of the amount a seller got in excess of what he wanted. The marginal buyer and seller, who were not pleasantly surprised by the interval's settlement price, pay nothing.

There is no opportunity for front running. If you bid lower than a major institution, your orders will be filled after the institution's orders. You can't re-sell to it at a higher price because it already has what it wants. Trading speed is irrelevant. All that matters is that your orders are in before the settlement interval closes, which happens on a human scale.

Why would such a system be unsuitable for our modern finance system?
Gamification to improve myself
The Muslim Brotherhood was democratically elected, I grant you, but behaved appallingly in power.

Your Iraqi friends weren't Kurds, were they? Even if Iraq was more peaceful under Saddam, I expect crime is pretty low in North Korea as well.

The Taliban may well be clawing back to power, and that is a truly terrible prospect for the people of Afghanistan, but their fate is in their own hands now.
Google folks don't understand GUI programming. Look at GWT, app script, Dart, Android and Angular JS. Google folks are brilliant in server side, though, e.g. Golang!

It's not because google guys are less smart but they are in a very different working environment than `modern startup`. In today's startup, developers are designers. We don't have money to hire graphic folks, UX specialists. We learn by coding, therefore the feeling of having control is essential. The popular MVC/MVM model is used to maintain flexibility and separation of concerns, not to dispatch work to different people. The AngularJS framework gives me the impression that the developers desperately want to hand the sh*tty html/css parts to someone else as if it's necessary evil. AngularJS projects are difficult to control since by its nature, users of the framework are encouraged to let go something that are essential to the control freaks.

Are you a AngularJS advocate and a corp dev?
I hope they have a laugh track.
Help support privacy software critical to journalists reporting on NSA
> I've never understood the stigma associated with all mind-altering drugs ...

One objection that comes immediately to mind is that it may divert from a search for the actual cause of depression. Remember that this treatment, like all depression treatments, is symptomatic. It doesn't either identify or treat the underlying condition, only its symptoms.
Which is completely opposite from Antic times, during which work was considered demeaning, because, hey we got slaves to do that stuff. Going out to the field and harvesting was looked upon same as now is rolling in shit. You could do it but highly degrading. Arts and philosophy were all the rage.
Motion blur is a function of distance travelled in screen space per frame and shutter duration, which can be very short for go pro type cameras in bright sunlight. So I wouldn't necessarily expect obvious motion blur.
Two-way Data Binding is really oversold IMO.

There are few cases where I want such a thing (like say updating the count on a shopping cart when an item is added). I don't ever want an item you're adding in a form to be showing up as you type it in a list in the background. That adds nothing and on the whole it's probably a UX negative effect.

I think it's brought up so much mostly because it's cool tech. But I don't see it actually solving problems.

MS had the same tech, with an arguably simpler implementation, years ago in ASP.NET. And while I've been out of MS development for awhile I feel like it's been largely deprecated. And it was never a "best practice" in the first place. It was mostly just a demo tool for MS sponsored "conferences" (read sales demonstrations by MS employees who went on to found Telligent).
Strange, 8.8.8.8 appears to be anycast and resolves to a east coast server for me, so I correctly get us-east-1 for netflix when I query it

FWIW, Google has proposed a solution to this problem: http://tools.ietf.org/html/draft-vandergaast-edns-client-sub...
This seems similar to what I've had to do with OpenCV in various iOS apps, but I think your results are more impressive than mine.

I had to sacrifice some quality in order to be able to do this with realtime video, but still, I should probably work out exactly what processing that command actually does and see if I can improve quality while still meeting the realtime requirement.

Thanks for sharing.
This is a blog linking to a blog linking to the source (from 2009).

http://googlecode.blogspot.com/2009/07/apollo-11-missions-40...
This depends heavily on what you mean by work. If by work you mean a minimum wage job at a McDonalds or Walmart, that isn't exactly what I would call purpose and dignity. For a meaning of work that included intellectual/artistic exploration without a guarantee of economic return on investment, but excluded economically viable but degrading labor, I could agree.
You can't reasonably expect regular people to know in which situations they'll be paying a premium for a liquidity

If you cross the spread you paid for liquidity. If you don't know this, don't trade.

Trading without understanding this is like coding without knowing what memory is.

It's completely fair to ask ourselves as a society if HFT groups are making a contribution to society...

The people choosing to purchase liquidity certainly seem to think they are. Their only complaint is that is that the price is not as favorable as they'd like.
Get a B2B Meeting for Customer Interview (Step-by-Step)
> It's completely fair to ask ourselves as a society if HFT groups are making a contribution to society that warrants the money they make.

An HFT once told me his company required a huge investment to operate. Besides the infrastructure costs, the company needed cash on hand for its buy orders. Given the small profit on each trade, it needed to do many, many trades. Which necessitated a lot of buy orders, and thus a lot of cash. When all was said and done, they didn't have a particularly high return on investment. The HFT didn't give me exact numbers, but he suggested that the ballpark ROI was commensurate with that of traditional brick-and-mortar businesses. (The ROI as he quoted it counted salaries and bonuses as part of the return, so those were not disguised as costs eating away the profits.)

If the HFT was telling me the truth, then it appears that at least his firm was providing a useful service and earning modest profits for doing so. Which would make his firm not so unusual in the business world. I have no inside knowledge of other HFT firms or other niches in the finance industry.
The "good old days" of psychiatry were a far cry from "the days of science."
As Bob Black pointed out in The Abolition of Work, if a job is worth doing, someone would do it, whether or not they got paid to do it. Charlie Stross made that point in his essay - he'd continue to be a writer even if he didn't need to write for a living.

The same is true of doctors. And farmers. And firemen.
The Office wasn't targeted towards people in the paper sales industries - but I'd imagine the target audience to be the same.
US Secretly built 'Cuban Twitter' to stir unrest
Death the True Motivator of Life
I think that's a pretty low bar. Hopefully they'll do more than that, and from the previews it seems obvious they will.
Go to 2:12 if you want to skip the fluff.
> So, calling it "getting high" can be very badly misleading.

If we understood what depression is, understood its cause, then a dismissive expression like "getting high" might be unjust. But as long as we're only treating symptoms, that's an appropriate description.
>But education industry (and universities) would have to change their methods, because nowadays peoples are willing to commit 100,000's of $ to get a well paying job, this incentive would be gone, the better paying one being the physical labor, with low education requirement.

Why would the incentive disappear? A basic income means that people don't make zero when they don't work; filling jobs would still be based on supply/demand, hence, implicitly, ability.
> applications designed for downloading copyrighted content disproportionately tend to contain malware.

That used to be true for web browsers but IE got a major update. Now with less drive-bys and exploits.
Nanex explains this stuff better than I will so I'm just going to link to their research (tl;dr summary of [1] below). I will accept not all HFT participants are obligated to follow any or all of these behaviours, but they are argued in defence of all HFT activity which is patently not true.

1. They Provide liquidity, false. Or at least works on a definition of liquidity that is not what would generally be used by other market participants (institutional or retail) - specifically see pinging or using orders to determine interest [2]

2. Tighten spreads, false. Attributable in the largest part to reg NMS not directly to HFT. Spread volatility has increased.

3. Lower costs, false. Cheap trading available via discount brokers before HFTs and additional costs to other market participants operating in HFT innundated environments are ignored.

4. Studies showing positive of HFT cherry pick and are of inconsequential detail, no conclusions should be drawn without deeper analysis of the data

5. Nannex guys just have an axe to grind repudiation

Plus ignores any other negative side effects of super-high speed trading such as stock specific flash crashes, data overload, and locked / crossed markets. Appreciate some of those can also be attributed to the proliferation of protected markets post Reg NMS.

[1] http://www.nanex.net/aqck2/4594.html
[2] http://www.nanex.net/aqck2/4592.html (appearing to violate SEA 9.a.1.A)
My Eclipse experience with Java 8 was so bad, I switched to NetBeans
http://code.google.com/p/virtualagc/source/browse/trunk/LICE...

"The software for the Apollo Guidance Computer (AGC) and LM Abort
Guidance Computer (AGS) is believed to be in the public domain."

Eh? So is it open source or not?

I doubt someone would come around and claim exclusive copyright on this, but still... Netlib had the same problem, and that's why replacements exist. The ACM still once in a while claims copyright on ancient Fortran code from the late 1960's. Back then it was a blissful golden era when people didn't even think that source code was elligible for copyright.
Just because there was an offer for $101 when I decided I want to buy, doesn't mean there will be an offer for $101 by the time I get around to placing my order.
It's probably not a fake or packed inside the chute, since he was under canopy for some time when this occurred. Low odds are not zero odds, but then again, it can be a clever April fools segment.

Also, chutes are not packed with great care. A main (the parachute you generally use) takes an experienced packer 5-10 minutes to fully pack and some people hurry through it to get on the next load. Outside of two things you need to get right (make sure the slider is up, make sure lines aren't over the fabric), it will open. Most of the packing is all about reducing the pack volume and slowing down the opening, not ensuring it.

A reserve however (the second chute sport jumpers wear), gets packed by a certified packer and gets re-inspected and repacked at least once every 180 days.
That mirrors my response to the $20M question, too. Congratulations: you have a vocation, not a job.

(Me? I'd finish off my existing more-for-money-than-for-love contracts, because I owe my customers. (I get paid a huge deposit in advance.) Then I'd get a lot more picky about what projects I tackled going forward; more willing to tackle not-obviously-profitable ones and less willing to do uninteresting stuff that merely puts bread on the table. Oh, and I'd hire a full-time copy-editor/proofreader, and PA to handle my expenses and travel arrangements. Then I'd move out of my apartment for 3 months and get it thoroughly remodelled, from the plasterwork up, because it's overdue to be rewired, could use a modern heating system, and I might as well redecorate while I'm about it. But apart from that, not a huge amount would change ...)
I have not down voted morgante, I want dialog. Sorry if I'm not spewing the party line.
One thing that I think it's a bit under-rated is the amazing openness between harvard and mit, despite on surface they often act like rivals (i attended grad schools at both).

For example, the cross-registration is a huge benefit. and many classes on both campuses you can see students from the other school. MIT $100K startup teams long have Harvard students involved. Now, at Harvard i-Lab I already see many resident teams having MIT co-founders (am doing EIR there).

In other words, i see it as getting two for "price of one" in some way... : >

Nothing bad to say about Stanford -- its beautiful campus is built for studying/thinking. i love its d.school and am a huge fan (did a short course only). but when Harvard and MIT has its own d.school, then...
I always think that when people compliment Cuba's medical system it sounds an awful lot like people saying of Mussolini "but at least he made the trains run on time".
A first look at my microbiome
NASA open source Apollo 11 code...5 years ago. How about a (2009) guy?
I wish people would not just downvote when they disagree, but state why they disagree.
Your example does exactly what the author recommends you not to do; cross the order book. In your example, you're supposed to place a limit order at 14.99.
Strangely I was just discussing this in another thread, but there's a shortage of doctors because the doctors have a union that ensures that is the case, as that is a benefit to their members. Any attempt to relieve this pressure, such as allowing qualified nurses to undertake more work, is strongly resisted by the doctors themselves. And they will fight automation too, for the very same reasons, and with many of the same soundbites.
Even after making the window big enough so I don't have to scroll, this is all I see:

http://imgur.com/9WWEFmz
But that would prop up the current dictatorship.
- yes
- yes
- yes
... but that's not to say it's a must or even a terribly significant factor. It merely makes you easier to say 'yes' to from afar, and that's it. I think people generally realize that the "github profile is a must" mentality is extremely likely to pass by highly qualified candidates in a hiring market where nobody can afford to do that. Willingness to torch any candidate that doesn't behave like a 25 year old groomed in the silicon valley of the last few years is not a successful hiring strategy.
"We cannot enable this yet, because foo isn't implemented yet, or because bar doesn't work correctly."