skysight-inc/HackerNews huggingface dataset:
In Denmark, we've had a special national card since the 1980s, called 'Dankort'. The fee for any transaction is 0.50 DKK, regardless of the transaction's size. This means that Dankort is almost always cheaper to use than Visa or Mastercard.

As such, almost every store in Denmark accepts Dankort. But - like every other place - they are not allowed to pass that charge onto consumers directly. So it mostly happens indirectly, i.e. the prices in the stores. It is important to note, that until a few years ago, there was no transaction fee on Dankort transactions. It was practically a public subsidised credit card system.

And it worked great.

Now the EU is requiring that bundled cards get a choice. You see, one disadvantage of the Dankort was that it only worked in Denmark. So they made a deal with Visa to make a bundled card, called 'Visa/Dankort'. In Denmark, it would use the Dankort part and abroad it would use the Visa part.

But now consumers are required to make a choice for each transaction whether they want to use the Visa or Dankort part. It might seem great that you get a choice, but there is really no reason to pick the Visa part in Denmark. But since stores aren't allowed to pass the costs directly onto the consumers who pick Visa, prices are likely to go up, even if just 1% of every transaction is suddenly a Visa transaction.

I assume these rules are part of the capping of fees in the rest of the EU, and many Danish observers also suggest that these rules probably work great in the rest of the EU, just not that beneficial in Denmark.
Malaysia Price Comparison Website – NEW
10 million $.
Googling "walmart parking lot analysis" yielded the following as the first result.

http://www.cnbc.com/id/38722872
New research: one brain hemisphere is on night watch when we sleep in new place
My bank issued me a debit/ATM card by default. I asked, and they replaced it with a plain ATM card that's not a debit card.

They also had this insecure-dy-default behavior allowing checking account overdraws to start pulling out of savings. It's worth checking that setting, too.
What Is JSON? How Do I Use It? Does It Beat BSON?
Yes, the only thing they need to track information is an IP number. If you use the internet, FB and Google know what you're doing.
Reservation System Cwic goes open source
Hi, I wanted to let you know that a Ruby on Rails project for managing reservations is now open source (MIT license). It has a lot of features, but due to the flexibility of the system we want to create, it is too much work for a team of three people. We hope that others could join us making this the best reservation system out there!

In essence, every reservation is the same: you want to book a place, object or service for a certain period of time. So, why isn't there a reservation system that does not make any assumptions on the entity that is for rent? With this in mind, we started developing Cwic! The flexible reservation system that is highly configurable. This provides an enormous amount of bennefits. If you are a hotel owner and also want to rent bikes, you can add the bikes as entities in the same reservation system you use for the rooms, and already are familliar with.
Billions is more documentary than tv show.
> I hope Walmart's decision snowballs.

Why?

The alternative would be that companies either don't accept credit cards at all (inconvenient) or charge an extra 2-3% for credit card purchases.

I don't see how that is any fairer than forcing cash customers to pay the full price as well. Somebody is losing either way, and I see absolutely no reason that cash should be privileged.
Ah yes, space. But I must confess I once waited in my flat to go outside, because one of my neighbours were in the hall.
Social problems become technical problems. Spam, unauthorised access, malware, spoofing identities, dos etc. would not be problems if we all just acted cool but instead solutions become minimum technical requirements for the next version.
Why should they be mutually incompatible? Abstracting some tasks to be easy enough for point-and-click use can definitely also co-exist with options that students, professionals and hobbyists can toggle to open up the underlying layers, at least with free software. With proprietary systems this whole discussion is IMO futile on the technical side. Vendors of proprietary systems can only be regulated by markets and laws, which has so far not worked except generally in their favour.

So I wasn't for an obsession with any one level of user but for catering to all levels of users, which seems to be technically possible now, so why isn't it happening? Instead we get closed-source systems with vendor lock on the one extreme or free systems which grandmas (which stands for any non-tech user) can't use as easily as their closed source counterparts. Why can't we have freedom (as in open development/transparency, not price) & ease-of-use together?
https://en.wikipedia.org/wiki/Astroturfing
Hey there,

I was enrolled in the 2013 edition of Analytic Combinatorics, but it seems that I am out of luck - no access to the materials either way. :-/

Does anyone happen to have the name of the 2013 edition? Or is it by design that these can no longer be accessed?
Can’t we all just admit that Snowden is a limited hangout who’s sole purpose is to benefit the establishment and NSA?

The forms of spying he discusses are trivial at best (backdoors in COTS technologies) without peep said about real advances in espionage. I want to hear about how TEMPEST-based projects are so good they can passively grab memory (and encryption keys) from miles away over the air, if that machine uses DDR memory buses.

I don't care if the Scots are spying on me (after all I'm Scottish); I want to know who's spying on the spies in Scotland thereby allowing terrorists safe passage because they now the see holes in their security. Damn turtles.
> maybe it doesn't exist because a Linux-only Ruby debugging tool is sort of a weird thing?

Linux-only seems perfectly acceptable, especially as more and more development moves to Docker containers.

Great write up, looking forward to seeing a completed tool!
Anyone know where he got all the raw data to feed his algo? Clearly he used a lot of data and the two main sources of free info i know of are google finance and yahoo finance. At least with google finance i run into issues with their api if you execute too many calls simultaneously, a bunch end up not returning any data
I don't think the 0.3% is the full cost, I believe it's just the interchange fee (ie. what goes to your merchant bank, not the credit card networks or issuer).

> Compared to that the 2-3% fees in the USA really seem to be very high as well.

Keep in mind that US credit cards offer 2% cash back, so the system isn't actually handing a bunch of money to middlemen.
WORLD WAR TRUTH THE MAN WHO FOUGHT THE BANKS
Portugal is in the EU so how come CC fees can exceed the EU maximum which is a fraction of a percent? (and likely less than the cost of cash handling for all but the smallest merchants).
I'm not sure what you want to do. Is your problem that you do want to see the native Java classes, or you want to hide them and focus on the Ruby code? Or is the key thing you want a Java flame graph?
Getting rid of tinnitus [0].

[0] https://en.wikipedia.org/wiki/Tinnitus
> In the first place, singularities-events correspond to heterogeneous series which are organized into a system which is neither stable nor unstable, but rather 'metastable', endowed with a potential energy wherein the differences between series are distributed... In the second place, singularities possess a process of auto-unification, always mobile and displaced to the extent that a paradoxical element traverses the series and makes them resonate, enveloping the corresponding singular points in a single aleatory point and all the emissions, all dice throws, in a single cast.

-- Deleuze, as quoted in Sokal and Bricmont's "Fashionable Nonsense."

Misusing technical terms in order to fake a veneer of intellectual respectability should be called out every time.
For Python, you can just use Pyrasite (https://github.com/lmacken/pyrasite) and inject a script which prints a stack trace for all threads.

I've done this to debug OpenStack in the past and it worked very well. There are many similar projects for Python, I used this one since it's in the RHEL repo.

Useful summary on StackOverflow: https://stackoverflow.com/questions/4163964/python-is-it-pos...
Abstruse Goose also has some deep wisdom about string theory. I particularly like this one:

http://abstrusegoose.com/424
I'll be honest: high energy physics isn't really an area where "hunches" carry a lot of weight, at least if those hunches aren't grounded in a pretty thorough understanding of particle physics and general relativity.

The language of "pinching off into new strings" is of course largely an analogy, one which captures some of the mathematical features of string interactions reasonably well while probably obscuring others. What's really going on underneath that analogy is just as "abstractly mathematical" as you could ask for: a (boundary?) conformal field theory defined on the 1+1-dimensional string world sheet, which allows just a single unique self-consistent mode of interaction. It is complicated, but honestly, so is standard quantum field theory when you really dig into it, and if you're familiar with the underlying math and physics this description is surprisingly elegant.
As a for instance, employers will(illegally) demand that the H1B worker reimburse them for the legal and filing fees as a form of retribution for transferring. While certain greencard sponsorship related expenses can be recouped if the H1B is that far down the line, any visa related costs (attorney, filing fed) must be payed for by the sponsor.

https://www.dol.gov/wecanhelp/h1bworkers.htm
> Cash isn't free for people either the vast majority of banks either charge you withdrawal fees or bake them into your flat account fees.

I haven't found that to be true at all. Are you speaking about a non-US context?

In the US you can almost universally go to your bank ATM and withdraw cash without a fee. There's also no fees for having a checking account.
I hadn't heard of perf - very handy indeed. It's in the linux-tools package for distros using apt. You will need to install both the generic package and the one for your kernel version.
>I'm alarmingly familiar with OVH. And their hardware failures. And their slow support exactly when you need them most. And their poor inventory control, leaving popular system configurations unavailable when I (or, rather, my clients) need them.

There's a plenty of places that aren't OVH, however I figured they'd be the most relevant choice here as game servers were being discussed earlier. DDoS protection being cool and all, something you really don't get on EC2.

>This isn't some deep-magic thing for sites with tens of thousands of instances, either--I've had clients with ten total instances benefit both financially and operationally from building out fairly straightforward elastic capacity (not least because the same code paths necessary for elasticity also makes things like setting up development environments single-click affairs, which enables deeper and more complete testing of the application to ensure correctness).

If for the cost of 10 instances they could've had 30 dedicated servers with better specs, did they really benefit very much? While I can certainly appreciate the part about development environments, applications that would actually benefit from such scaling are rather rare. Although, admittedly, if they hired you they probably did need it.

>Even were a $2200 premium a credible number, that's eleven hours of my billing rate.

$2200 per instance, does someone only running a couple of boxes even need your services?

>Reimplementing what AWS provides even a fairly straightforward system--easy, API-driven system deployment and configuration (and while OVH's public cloud APIs can enable some of this, your "dedis" cannot), straightforward and API-controlled support services of more or less any stripe, integrated system monitoring and alerting--would be hundreds of hours of work, be a worse solution, and require ongoing maintenance.

And again, I believe most businesses simply don't need what AWS providers. AWS is certainly a good choice if you actually need what they offer, however very few do.
Windows Docker is just around the corner!
The idea of a rebate puzzles me. I'd rather pay less up front. A rebate gives me the idea something sleazy is going on.
Please, correct me if I am wrong, but doesn't NoScript w/ Goog & FB removed from the whitelist solve this problem? Granted, using Goog services unlogged-in(?) puts you in their cross-hairs, but the sea of analytics and adservers can be avoided using NS(better w/ adblocker & user-agent spoof)to profoundly reduce your signal on the line. IP's addy's are unique, but unless you specifically requested 'static', yours is changing w/ varying frequency, as well.
I think this is partly driven by population density. In much of the US, there's only enough people for ~1 such club in a given town (and often barely that).
> Regenerative braking reduces wear on brakes. I am still on original brakes after 72000 miles.

Wut.
I think social networks like Facebook cover the case of when you want to broadcast your information or activities at once to hundreds possibly thousands of people.

A single friend can call/text/drop in to tell me about something, but what if that friend wanted to lets say inform a 100 of his contacts of this without having to send 100 texts/call/emails and keeping track of all of them for responses?

And social networks aren't just restricted to people but there are plenty of groups, organisations and clubs that want to reach out to not only all their members but potential audience too. Of course they can publish articles/ads in papers/magazines/TV, stick-up posters, send unsolicited email/calls etc., or they can have a Page/Group on Facebook.
Before the housing crash and subsequent credit tightening and lower interest rates, you could get 5% on a standard savings account. That, coupled with negotiating no fees on a 0% balance transfer check could was more lucrative. I can't imagine it being worth the hassle and short-term credit hit for the paltry savings rates today.
Ask HN: Pursuing which certificate really improved your knowledge?
On my corporate job they want to set requirements for some advancements to have certain certifications (Oracle java certs, Spring core certs...), so I am curious for you guys who already got some certs, did you enjoy getting them? Did some of them, and process of learning for them really substantially improved your knowledge, filled missing holes, etc..? Which ones you think are really good ones?
> can be a viable option

To win the northern market, without massive subsidies, electric cars need to be better than viable. They need to be better than gas car. In cold weather, that will require an order of magnitude increase in energy density. That's a couple decades off imho.
Your middlebrow dismissal doesn't work here because the parent didn't say it's not a problem or that it doesn't happen. The parent is refuting a point that successful traders exclusively become that way by trading on illegally obtained information.
2nd largest commodity in the world, IIRC.
> But your solution cannot fix the conceptual lack of clarity that follows from the decision of the API designer to return both error information and data for further processing from the same function call.

That's exactly what Go's API does: it returns error information and "data for further processing" from the same function call.
Thanks. It has no information about the technique being leaked by the SEC, though.
The mushiness of Toyota handling translates much better to trucks I have found.

When you take a small car and make the handling mushy, it's like driving a smore.
Aside from being a set of instructions to complete some computational task, server-side code has very little similarity of process or structure to client-side code. "Isomorphic" is a bad description no matter what intellectual discipline you pull the word "isomorphic" from.

Taken from crystallography, the JavaScript here is like the oxygen in silicon dioxide and in water. Same material, same physical properties, completely different structure and function depending on where it is.
This also puzzles me. Paying directly should inspire more trust than taking out credit and paying it off a few weeks later.
> No major retailer can afford to stop taking Visa.

It might surprise you to know that Costco for years only accepted AmEx (and soon will only accept Visa).
Vitamin D derived from sunshine notably UVB reduces the shrinkage of the telomeres.
Some credit cards offer some cash back (usually 1% on most transactions, 2-6% on specific types of transactions). If you don't have a cash back card (e.g., you're using a debit card that is processed by VISA, or you're using one of the many non-cash-back credit cards), the card company keeps the entire fee.
Ubuntu does, however. Here is its guide:

* https://help.ubuntu.com/lts/serverguide/postfix.html

Here is where it is enabled by default:

* https://git.launchpad.net/postfix/tree/debian/postfix.postin...

And here is where the installation process auto-starts the server:

* https://git.launchpad.net/postfix/tree/debian/postfix.postin...
Have had only debit for 20years and never used credit. I have not seen a single transaction rejected because the visa/MC debit cards weren't credit cards. Either they aren't countless or they must be focused to a few countries.
That only works to some extend. You'd need a different story for each suspected leaker and you can't fake what people are actually working on.

One strategy would be to subdivide Tasks in to small enough segments that you don't know what the big thing is you are actually working on. But this lack of overview might be very hindering/expensive.
Some of it can be publicly available data that others just haven't thought to use. In another comment someone has mentioned the Walmart carpark satellite imagery example, where they could estimate trends in Walmart's sales by counting the number of cars in the carpark over time.

Nik Cubrilovic recently demonstrated how information leakage can be used to trade stocks, eg estimating the growth rate of the Adobe Creative Cloud customer base based on assigned customer ID numbers, before Adobe announced the figures themselves:

http://www.itnews.com.au/news/how-an-aussie-hacker-used-info...
Oh I thought the SI had some kind of analysis.. A priori though, I do think the differences point at misspecification. Too busy/lazy to formalize this claim though, I admit..
A Russian Cybersleuth Battles the ‘Dark Ages’ of the Internet
"Somebody is losing either way, and I see absolutely no reason that cash should be privileged."

It makes a huge difference. A market economy depends on prices to guide behaviour. It's very important to make sure that all costs are internalized.
DevTools in 2016: Accelerate your workflow – Google I/O [video]
Java classes and a flame graph would be nice sometimes. I really only know how to use pry and Virtual VM with JRuby.
So glad he blew the whistle on this one, on the internal security of an ally.

Snowden is a traitor to the USA, and an enemy to its friends.
"at least now they know something's rotten because you told them and maybe there's even a couple of them who'll take some action."

If nothing else comes of his courageous actions, Edward Snowden saved me from a few years of 'that look' when I try to inform people why all those 1/2 trillion dollar tech behemoths are giving so many services away for "free".
False and false. Used visa and mc debit cards exclusively for 20 years all over the world and online.

You must be speaking of something different such as "Visa electron" debit cards.
Now the real question is: when are the telomeres rebuilt?

Because every individual started with one single cell, from a father and mother cells that also underwent cell division

Hence at some point in time these telomeres get rebuilt/replenished.
> "clean consciousness"

Which just happens to work so much better when your electricity is not provided by coal plants...
>Can’t we all just admit that Snowden is a limited hangout who’s sole purpose is to benefit the establishment and NSA?

No, because that's absurd.

A "limited hangout" is fundamentally a damage control measure. At the time Snowden went public, there wasn't any damage to control. Most of it had already been done many years prior with the 641A scandal.

If you want to suggest that Snowden was an overarching plan to somehow influence public perception in the NSA's favor, then perhaps /r/conspiracy would be more receptive.
Interesting, it looks like Sam Saffron's FlameGraph gem https://github.com/SamSaffron/flamegraph has worked with JRuby for about a year and I hadn't noticed.
That's only some of the consumers. Even if there's 5% less business/revenue to Walmart as a result of this decision, that's a huge hit.
It's more fair because the consumer pays a 2-3% premium for the convenience of a credit card vs. counting out cash, and people who don't want that convenience aren't obliged to pay for it with universal price inflation. Since this is a choice that the consumer makes, it's reasonable to make him pay for it.

In practice, I think most traditional retailers like it when consumers use cards because it makes their lines go faster and wouldn't really increase their prices for most card carriers if they were allowed to do so (AMEX might be a different story). The cashier doesn't have to wait for the consumer to fumble around for the correct combination of bills and coins, the customer doesn't have to wait for the cashier to count out change, and that means the line moves faster and the retailer can process more transactions and make more money.
But Washington Post says he is for real. So does the Guardian. And he is telling us which programs to use and which crypto is or isn't broken.
I saw it once at a small computer store in Ottawa in 2008.
Those comments really doesn't surprise me.... Armchair CIO
>The invariant is enforceable

No, what you are showing is how an API designer could enforce a particular API design decision. That's fine, but what I'm talking about is how a language designer could enforce the invariants of a particular error handling concept. I think that sum types alone are not sufficient to do that.

But I have to say I really don't like your tone. I'm not asking for one thing and then the exact opposite. I'm simply discussing pros and cons and I'm thinking about the consequences of different designs.

I'll make my mind up when I feel I know enough the subject to do so. If that offends you, then I suggest you talk to someone else.
"You must ensure all your friends never post pictures of you on FB, preventing them from building a profile about you by association" -> Posting pictures about someone is iirc illegal in plenty of places without their consent, or at least borderline legal.
Pulse Nightclub Shooting, Google Ads in Arabic
App subscriptions were always inevitable
Interac (debit cards) charge 5 to 10¢ per transaction and that's about it (+ presumably a fixed monthly fee). Everyone has an Interac card (if they have a bank account).

One problem with Interac, however, is that most banks have limits on how many transactions can be done per month, or pay additional fees. The fees can easily add up to ~ 100-150$/year for an average bank account. We can go around it by leaving 2000-3000$ at all times in the bank account, or get a credit card. Win-win for the bank. So yeah, Visa deserves the pushback.
Unless you are using tor or something similar you are still giving your IP address out.