skysight-inc/HackerNews huggingface dataset:
Measuring conversion rates for 2-Factor Authentication
And don't forget that you also have to get rid of 300kW of heat. Having worked in a supercomputing center, this is a major problem — think about how quickly you have to shut your computers down if your heat exchanger goes down, before the room gets too hot to enter.
What is the difference to GnuCash?
Why not contributing to it or the other numerous Free Software ERP systems?
Thanks. I've read Hillis's book but not studied the modern stuff; I'd gotten the impression the hardware was capable of about as much, and faster now, even if organized differently -- shared memory instead of a network -- and with less-pleasant languages.
Wow - this story ticks so many tick boxes for HN readers:

1. An important person who can code - for all those who moan that those in power do not understand tech at all.
2. He used C++ - for all the rust-tards and c++ haters
3. He mentions Haskell - for the fp buffs claiming it is the one true way.
It is most definitely 'easy' to burn 500+ calories in one session.

One hour of squash burns 600+ calories. One hour of running burns 600 ish calories. One hour of cycling burns something like 400-500 calories.

No citations for these figures, just going off memory

Burning 500+ calories per session is definitely doable - if you are doing the right exercise in the right ways for the right duration.
Australia Demolishes Tallest Structure in Southern Hemisphere
Join the webinar Together Forever: everything about retention
Here's the message from the host of the webinar - get to know what you'll learn.

Hello! My name is Vasiliy Sabirov, I work as an analyst at devtodev.com.
If you are dealing with mobile applications, the word "retention" is familiar to you and you probably say or at least hear it every day. And that's really the most important indicator for the business.
I decided to learn about retention as much as possible, to examine the figure far and wide. And as I have accumulated enough knowledge, I want to share it with you.

In order to do this, I will hold a free webinar "Together Forever: everything about retention" and share with you everything that I know.

1. What is the retention and how it is measured. It turns out, that it is not so simple, and everyone calculates retention in his own way. I'll tell you about the existing methods of its calculation.
2. What is the perfect retention? I will give the examples of the values of retention from the industry for you to have something to compare your performance with.
3. What determines the retention?
I will compare the retention of paid and free traffic, tell you how this figure differs for the different platforms. Besides, there exist even the dependence on the day of the week. We'll talk about everything.
Spoiler: Do not acquire users on Saturday!
4. How to improve retention? The Internet is full of various tips about this, and we have chosen the most interesting and effective.
I'll tell you about the best way to use push-notifications, regular assignments and gifts for the return. I'll also mention other methods that exist there.

At the webinar you will be able to ask questions and I'll try my best to answer them.
Though, my goal is for you to have zero questions about retention by the end of the webinar.

Register for the webinar now!

Webinar in English
Tue, Apr 28, 2015 5:00 PM - 6:00 PM GMT
https://attendee.gotowebinar.com/register/2660867983129314818

See you!
The DEA Has Been Secretly Buying Hacking Tools from HackingTeam
And for every one of these we have 100 Dianne Feinstein-s and Joe Bidens
Proving that the new idea is supported by mathematics is definitely important

No, it is all that matters. Having a neat and intuitive understanding of a new idea that is wrong has at best no value and at worst is actively harmful.
>but a vehicle with a blown head gasket is not a "perfectly functional vehicle."

…leading us back to why the sensors try to stop you completing the destruction of your engine. No common sense.
An interesting talk on "￼How to Build an Open Source FPGA toolchain" was presented at the Open Hardware Workshop a few years back: http://www.ohwr.org/attachments/821/sebastien.pdf
After I installed 12s on my OnePlus One the other day, first thing I did was try Boxer against https://emailprivacytester.com/ - It failed on the link prefetch test. I reported it and they said they'd look into it. I've heard that the iOS version of Boxer fails quite badly but I've not tested that myself.

[edit] The main problem with K-9 Mail IMO, is that it only supports inline PGP. I.e, it doesn't have PGP/MIME support. It's open source, and there is a ~$1000 bug bounty for this functionality at https://www.bountysource.com/issues/815255-pgp-mime if anyone wants an Android project.
User database as a service?
Hi, is there any database SaaS with Auth focus? Like tracking usage patterns, handling salting and generally hack proofing the DB?

Anything that will observe usage patterns to identify stolen accounts?
I tried inbox a while ago and stopped using it shortly after. I really dislike the interface since It seems really cluttered and distracts from the simple form of communication that e-mail should be IMHO. I do like the function to snooze an e-mail for a specific location, but not enough to keep using Inbox.

I really prefer Mailbox by Dropbox, since the interface is much cleaner and it functions pretty much identically.
Radioactive Drone Found on Japan PM's Roof
Interesting work. The part on scalable web architecture is very nicely written and the advice there is very valuable. http://aosabook.org/en/distsys.html
How history’s most creative people organized their days
This whole node.js trend has really gone to far IMO. Sure nodejs works for a web server but seriously, JavaScript hadoop implementations?
In very rare cases, you could see confirmed writes being rolled back, or reads returning data from before a confirmed write

How these problems will actually affect you depend on your applications. It could for example allow 2 users to be created with the same email address
Open Source Mechanical Split Flap Display
Should have a warning: Starts playing loud noise when entering page.
Doctors don't bite, you know.
There is a bug in the latest GPG version that makes it unable to detect smartcards.
Jump to the sudoku solver section: https://www.youtube.com/watch?v=49YeHvJ6yZg&t=9m33s
“A Child And His Lawnmower”
https://www.youtube.com/watch?v=frgENbP1lYY
I wonder, maybe someone can answer: why is Chernobyl still remembered while nobody talks about Fukushima anymore?
Generalising a bit, it seems to me that in Asia a lot of political leaders come from engineering, whereas in the US and Europe many come from the humanities, especially law.
Starts at 8:40
Another related fact about Singapore: every tree in the country is tracked with its own row in a database

http://t.co/WMuBIv5tYk
So he's as good a politician as advertised.
Soleau software. Those guys cost me many an hour back in the days.
The Most Futuristic Predictions That Came True in 2014
He got Cambridge Diploma in Computer Science.

[1]http://en.wikipedia.org/wiki/Lee_Hsien_Loong#Background_and_...
This is cool. Python 2.x or 3.x?
He also published a paper on economics quite a while back (http://www.jstor.org/discover/10.2307/1882634) on externalities. Not surprising, given the proactive Singapore government.
This hum terrorized me for months in Kirkland, WA. I falsely accused my neighbors over it -- they were completely innocent. Ended up moving a few miles away and haven't heard it since.
100 domestic fan heaters running at the same time? Toasty...

It's not that the Cray 2 isn't amazing, it's that modern chip tech puts at least that much power in your pocket, while desktop chips are far faster.

Aaaaand - it's all air cooled and apparently effortless, and the CPU does it all with <100W or so, and it's so cheap almost anyone can buy it.

Really, that's at least as amazing as the Cray series.
You need tests everywhere, statically typed doesn't mean you don't need to test.
No garbage containers just generally available. And putting trash out on the street will at best get me very angry looks from my neighbors and worst a fine from the police.

The correct way to get rid of any garbage that I can't fit into the garbage chute is to take it to the dump (which is a bit tricky without a car).
My father, a machine engineer, built a wooden chair out of oak last week
I'm surprised they didn't mention the keto diet in the WSJ article.

In this paper, we highlight how an excess of dietary carbohydrates, particularly fructose, alongside a relative deficiency in dietary fats and cholesterol, may lead to the development of Alzheimer's disease

http://www.reddit.com/r/ketoscience/comments/32ew4h/nutritio...

There's also the recent UCLA study where 9/10 patients improved after going on a keto diet http://neurosciencenews.com/alzheimers-memory-loss-reversal-...
This isn't that surprising. Lee Hsien Loong studied at Trinity College, Cambridge, where he was Senior Wrangler, and graduated with a first class honours in mathematics and a Diploma in Computer Science (with distinction).

He's mentioned in the past that he briefly considered a career in academia (Mathematics). That didn't happen, of course. (source: http://www.moe.gov.sg/media/speeches/2003/sp20030603.htm)
Take back control of your -g Node.js packages on Windows
But it doesn't explain why I can't hear it in just as quite places in different locations. If it was tinnitus wouldn't I here it in other places as well?
But this is a good thing. It will show people that surveillance does come with consequences. Only then it might be opposed.
That's 40 years ago. I think it is surprising that a man as busy as himself has had the time to pick up this hobby on the side.
What I love here on HN is that even though everyone here seems to hate on MongoDB, it keeps on rolling, improving, and getting used in real companies. There may be "better" (for spurious defn of better) products like rethink or whatever, but folks just aren't using them. Get over it!
I have indeed noticed a tendency in the West lawmakers to believe that when human and nature laws collide, human laws should win ...
Cambridge professor about Lee Hsien Loong:

"No, he was truly outstanding: he was head and shoulders above the rest of the students. He was not only the first, but the gap. I think that he did computer science (after mathematics) mostly because his father didn’t want him to stay in pure mathematics. Loong was not only hardworking, conscientious and professional, but he was also very inventive. All the signs indicated that he would have been a world-class research mathematician."

"I’m sure his father never realized how exceptional Loong was. He thought Loong was very good. No, Loong was much better than that. When I tried to tell Lee Kuan Yew, “Look, your son is phenomenally good: you should encourage him to do mathematics,” then he implied that that was impossible, since as a top-flight professional mathematician Loong would leave Singapore for Princeton, Harvard or Cambridge, and that would send the wrong signal to the people in Singapore. And I have to agree that this was a very good point indeed."

http://therealsingapore.com/content/cambridge-professor-lee-...
>And then, if I pick any oracle at random, then isn't there an infinitesimal (yet non-zero) chance I could pick one which has a special structure which makes their result false?

No, the probability is zero. Which, note, does not mean it's impossible. That's a common misunderstanding of probabilities. E.g., if space is infinitely divisible, then for any particular point on a dartboard, the odds you'll hit that point are 0, and yet this doesn't imply it's impossible to hit the dartboard
DOE Selects Intel to Deliver Nation's Most Powerful Supercomputer
Why a varied backlink portfolio is important for new websites
Google may launch wireless service Wednesday
Chernobyl was a lot more serious? Fukishima hasn't killed anyone [1] where as Chernobyl killed at least 40 people directly [2].

[1] http://en.wikipedia.org/wiki/Fukushima_Daiichi_nuclear_disas...

[2] http://en.wikipedia.org/wiki/Deaths_due_to_the_Chernobyl_dis...
It seems hard to understand in our eyes, but you have to appreciate the lack of education and superstition in Brazil. If you ever read the famous feedback from Feynman about the standard of teaching in Brazil (shit) then you would know why.
Could you link to that discussion? The article here suggests otherwise:

https://en.wikipedia.org/wiki/UK%E2%80%93US_extradition_trea...
> Auto-import with Ledger is trivial and programmable. You
> should have a look at the ledger convert command.

That's good to hear

> Another major benefit is that Ledger data is stored in
> plain text files and can be put in a git repo.

I don't think I've encountered a situation where that would be useful.

> Currently I have more than 7 accounts across various
> regions

I am running 37 accounts in 4 currencies. Some of these represent checking accounts, some are CC accounts, some are stocks and shares, one or two are assets that I'm depreciating over time, there's an informal loan owed to me, a loan I have been given from a bank, and I use a couple of virtual ones as a budgeting mechanism. On top of that, I have about 60 various categories (which are - I guess - another type of virtual account) for various sources of income and expenses. Many of the above are hierarchal in nature. About 1/8th of my transactions are actually one-to-many transactions rather than one-to-one. This represents my personal accounts, and not my business accounts, which I let FreeAgent + an accountant handle the gnarly details of.

While this may sound complicated, it is in fact incredibly convenient, and it's exceptionally easy to pull out (or put in) almost any kind of data I want.

The GUI autocompletes my transactions as I create them, remembers how I like to categorize stuff, comes with a lot of built-in graphs, syncs to my iPhone (although the iPhone app is a bit naff), will automatically create transactions for me on a monthly basis if I want, and presents me with a dashboard.

I am just about old enough to remember people dismissing colours in their xterm's as being too hipster and distracting, and also about old enough to remember some people proudly saying `lynx` was all they needed from a text editor.

I cannot imagine why I - and I spend almost all day in a `screen` session already - would want to hand-edit my transactions in a text-editor and use a CLI tool.
Sexy FEMALE BODY LANGUAGE
If only we took that as a measure ('is this so important that it can save human lives'), we'd stop the vast majority of testing on animals. So that would be an easy win.

But the lowest hanging fruit is killing animals for meat. Mainly for the joy of having a nice taste in their mouth people who don't really need it eat vast quantities of clever, sentient animals who lead miserable, short lives. The trade off seems easy to me.
This seems like a great resource to read about the architecture behind a lot of great applications and tools (nginx, scalable web architecture, nosql databases, git just to name a few). Definitely going to bookmark for later.

Related to that, I wonder if there are similar resources for learning about Blender's architecture (open source 3d modeler that has its own tiled UI system and integrates with an internal python interpreter) or the Linux kernel. I feel like those could be immensely useful for studying/understanding those large codebases for newcomers.
Autism risk genes also linked to higher intelligence
It might have been feasible to migrate the data to another account management software using a script to export ledger data to a widely supported format like QIF (https://en.wikipedia.org/wiki/Quicken_Interchange_Format)
Pushdo spamming botnet still active in the wild
Seymour Cray, the supercomputer architect, set up a new company, SRC Computers, and started the design of his own massively parallel machine. The new design concentrated on communications and memory performance, the bottleneck that hampered many parallel designs. Design had just started when Cray died suddenly as a result of a car accident.

He died on October 5, 1996 (aged 71) of head and neck injuries suffered on September 22, 1996 in a traffic collision. Another driver tried to pass Cray on Interstate 25 in Colorado Springs, Colorado but struck a third car that then struck Cray's Jeep Cherokee, causing it to roll three times. Cray underwent emergency surgery and remained in the hospital until his death two weeks later. The Jeep Cherokee was designed on a Cray super computer, what a sad coincident. (source "The Superman" book about him)

When he was told that Apple Computer had just bought a Cray to help design the next Apple Macintosh, Cray commented that he had just bought a Macintosh to design the next Cray.

http://en.wikipedia.org/wiki/Seymour_Cray#Cray_Computer_Corp...
Angela Merkel has a Phd in chemistry. But many (most?) European leaders are actually technocrats.
In Malaysia and Egypt it was just so swift. They didn't even care about my bottle of coke.
See also https://github.com/bashrc/fin
You get ones as big as that in the River Ebro in Spain. The ones she saw are not record breaking, I agree.

If you're a non-angler who lives somewhere like the UK where freshwater fish are pretty small, you would think it's gigantic.
That law is a humanity is an interesting lingual twist.
I'm wondering when we will see an implementation of Datonic that has a more liberal license.
The organisation will not change without external pressure. External pressure cannot be applied without knowing what it is doing. Knowing what it is doing is illegal. The organisation will not change.
Reisebüro Sachsenheim – Google+
That was hilarious. I have hacked something like this a while ago (autoscrilling from bottom to top), but without the elevator-references, and the music...
Singapore is a great place. Very meritocratic, high-tech, modern and forward-looking but it is a sort of benevolent dictatorship.

This is Lee Hsien Loong, the son of Lee Kuan Yew who built up Singapore (obviously a brilliant leader but also, with little oversight, worryingly quick to jail his critics). The People's Action Party (PAP) has been in power since Singapore's formation and opposition party leaders have found themselves in jail or sued into bankruptcy. Benevolent dictators and dynasties work great until they don't.

It will be interesting to see how Singapore fares a few leaders down the line. Hopefully pretty well and more politically tolerant; as it's a nice place with great, talented people!
Show HN: How to Get 1,026,826 Views and 75,001+ Email Subscribers (Case Study)
Here's an old thread https://news.ycombinator.com/item?id=6404929
Ahh yes, modern computers put these older systems to shame in some regards, but what did the typical desktop have back then?

There's a person out there who made a 1/10th scale cycle-accurate Cray-1A...which is truly pretty cray
http://www.chrisfenton.com/the-numbotron/
Their pro plan.

They have just one pro plan - $10/month for 1 TB. I don't need 1 TB but I do need 100 GB. Why can't I just pay for what I need?
There is a lot of classified work on GaAs for communication links where the speed of demodulating/modulating a signal is critical.

But for general computing, implementation is more critical, consider that the Cray T3E sustained 1 teraflop of computing power, while 3 years ago the Cray-3 could sustain only a meager 16 gigaflops - clearly silicon could deliver performance (and it does so today!).
That is effectively a form of arbitrage, I suppose. You're charging the battery when electricity is either cheap (middle of the night), or free (from solar on your roof) and then using it in place of expensive day time electricity.

You could argue using battery electricity in stead of bringing in grid electricity is functionally equivalent to selling it to the grid, both in terms of pricing incentives, and the effect on the grid – in the same way that people are discussing being able to switch fridges on and off minute by minute as being equivalent to building grid generators which can be switched on and off on that timescale.
I was going to say this, but I ultimately don't think it'd translate well to even a TV series - it's just too long and too in-depth
You've never heard of the security clearance requirements, I take it.
Like many people in tech, I've come to the conclusion that managers need to have done at least one component of whatever they're managing. Hopefully the critical component, if there is one.

This is just as true for politicians, and I think this guy is a great example. All this talk about advancing STEM education in the West, but which country is leading? The one where the leader is a top STEM graduate.

Anecdata: I've been to Singapore several times, have loads of friends there. They really are better educated than your average western adult.
My earliest memory was from when I couldn't talk and remember deliberately shaking the bells attached to my leg to attract my mothers attention. Granted I was most probably over a year old then.
> where he was Senior Wrangler

For those unfamiliar with the term, this is a huge achievement.

http://en.wikipedia.org/wiki/Senior_Wrangler_(University_of_...
I was in an Amtrak station once and observed a DHS officer with a dog. While the officer was occupied talking to someone a person stood by them for a while, walked past and came back again, then walked away; all behind the officer where they wouldn't have been seen.

The officer finished with what they were doing and started to walk away and the person returned. Shortly after the person entered the line of sight of the officer the dog, who was constantly looking at the officer's face, 'triggered'-- wagging its tail and moving excitedly towards the person; whom the officer immediately detained.

When the crazy door to door dog searches case was before the supreme court, I took some time to read a bit about the subject; there is virtually no structural protection or really any review that prevents the dogs from just being a laundering mechanism for their handlers (perhaps unconscious) suggestions. Though they do have true positives to the extent their accuracy is characterized at all, they're not very reliable, and very little is done to analyze or control for false positives (and many officers that handle them seem to believe there are basically no real false positives-- that instead false triggers must be on 'residue'), though there seems to be no scientific basis for that belief. (Though there easily could be; a reasonable practice would be to log and track all triggers by each dog and the results in order to monitor their performance and establish their their level of both type-1 and type-2 errors).

Unfortunately, the courts are continuing to allow wide leeway for something that appears to be almost pseudo-science-- ascribing near magical properties to the dogs-- presumably because we like the result and it sounds reasonable; evidence be damned.
Any decent size transformer (or AC motor) in or near your house would hum at 60Hz (plus a bunch of harmonics).
The big one on that utility pole down the street seems like a perfect candidate.
Roomer has it that the original Cray 1 design didn't have a tunable cooling unit. One day the test machine crashed, and the engineers came in the next morning to see a giant icy glacier.
The oyster travel cards in London are Mifare cards (not actually classic ones though) but the system was designed in a way to be resilient to attacks on the card.

When you tap the card on the reader the transaction happens locally with the card and the reader, this means that there is no latency and the system can continue to operate even if the central server goes down.

Every minute or so the machines sync with a central server and if at any point a machine saw a card with a balance or journey history that conflicted with the server copy then that card gets blacklisted and no machine will accept it any more. This means if you clone a card you can use it to start your journey but by the time you get to your destination you won't be able to get out.