skysight-inc/HackerNews huggingface dataset:
Consider 1.4.13c:

Find 2x2 matrices such that CD = -DC, not allowing the case CD = 0.

Of course one can just take a shotgun approach, i.e. come up with some arbitrary possibilities and then manipulate their elements individually until the equation holds. But what's more interesting is to view the matrices as operations on columns or rows, come up with operations that have the desired effect, then encode them as matrices to answer the question. What such ways are there to look at this little problem?
Where I live we simply use windows rather than radar for looking through walls.

I understand that there are law enforcement and military applications for this kind of tech, but I really wonder if we need to add the ability to see through walls to the long list of privacy invading technology that is already available.

There are very few good applications for this technology and lots of bad ones.
I think the fundamental differences between Dropbox and iCloud is the sharing feature and Windows/Linux/Mac/etc support. iCloud is never going to be on Windows and our company uses Dropbox to share project resources and our machines are a mixed of PCs and Macs so iCloud means nothing for us.
not surprising, Dropbox is an actual business with long term potential. And with recurring revenue model, they have growth in revenue every month.

There is no need for them to flip like other sites who either need to make sales every month to stay in business or are reliant on Google staying nice to them in order to keep their traffic numbers.

Recurring revenue really is the key to lasting success on the internet.
I'm at school all day, but I'll post something tonight.
No, just because a site allows users to upload files doesn't mean they can replace the top-level index.php, for if that were true then whoever setup that server needs to look for job opportunities in the circus.

The problem with removing the PHP handler from all other writable directories is the reality of dealing with many 3rd party modules, themes, and apps that have their own upload directories, and sure you can audit all 3rd party code and rewrite it yourself, but you should also assume the code is full of holes anyway and configure the other layers in your stack according to the principle of least privilege.
Maybe they should use big cat names?
Silicon Valley's Top 25 Under 25
I think you've missed the salient point:

if computer makers wish to distribute machines with the Windows 8 compatibility logo, they will have to implement a measure called "Secure Boot."

I obviously have no idea how much that little sticker is supposed to be worth in terms of sales in store, but if Dell, say, complies while others do not they can legitimately claim 'only our computers are windows 8 compatible'.

MS is targeting the distribution with this, not the end user, so traction is a lot easier to get.
I always thought there was tic-toc collusion amongst Canon and Nikon --ie. Nikon ups the FPS, Canon ups the MP; Canon ups the FPS, Nikon ups MP or ISO, or something else. Or one has nice Lens aperture but the other one's lenses have less distortion, etc.

These two companies seem to trade-off on features every other generation (tic-toc). I think they had a common history, some decades back.

"Their friendly rivalry" speaks to this, in a way. http://search.japantimes.co.jp/cgi-bin/nb20071226a7.html
I don't see where anyone was locked in? It's not really possible to lock someone in a building, because it's actually against the fire code to make an building that can do that.
Great for the many HP employees like myself who got a TouchPad in the employee fire sale, supposedly there will be a lot of TouchPads going out as Christmas presents. If nothing else, the current TouchPad population is one giant, if expensive, beta program for WebOS - let's hope someone does something awesome with it.
Scientists Discover Way to Make Anything a Touchscreen
I wonder how much of this is attributable to bonus payouts.
So Apple are holding steady (in terms of market share) with a 15 month old phone in a massively growing market (these figures are pre the 4S). That's not bad.

Android's growth hasn't been at the expense of Apple, it's just coming out of the general growth in the market (in terms of the absolute numbers) and at the expense of the other players (in terms of the market share).

The reality of the Apple vs. Android battle at the moment is actually Apple and Android both squeezing hell out of RIM, Nokia and Microsoft.

That will change in the coming months (RIM will bottom out, Nokia and Microsoft effectively merge and will throw the kitchen sink at it) but for now it's hard to see with Apple or Android as losers.
> I don't think the "Secure Boot" implementation will get traction.

Did you read the article? It's not about "traction", it's about having that sticker or not:

"to distribute machines with the Windows 8 compatibility logo, they will have to implement a measure called "Secure Boot."

> RMS has tainted enough for me.

Consequently, Secure Boot is OK :-)
I think you underestimate the value of marketing.

As fun as consumer services are most people aren't going to pay for them (or will pay very little). The real value in these types of services are Power Users and Business.

As someone who considers himself a power user and who runs IT for a business I can tell you Dropbox has been very effective in its marketing. We use Box.net and my users are constantly pushing for Dropbox because they use it at home and find it preferable. If Dropbox had the features we probably would have switched by now.

Same with Power Users in that word of mouth is likely to influence these people (though again I'd argue features in that the streaming ability of SugarSync is a real advantage for those users).

So as crazy as it seems Dropbox is essentially using you for marketing. Think about it, companies pay millions for a couple minutes of Superbowl time. With that money Dropbox gives millions of users a free service and uses word of mouth to carry it along.
Facebook forbids a lot of things, but that doesn't mean that they don't happen anyway. Before you ask me, I don't have any data about how many multiple accounts there are on FB, but my anecdotal experience suggests that there are many. I also think that it would be very interesting to actually take a survey about that, and about how many people would like to have multiple identities without violating the TOS.

About resharing, of course if you use the same real name in both services that would't be different from circles - it would just make it much harder to reshare, but by no way impossible. That's not my wife's use case. But if you use different names, tracing you becomes pretty difficult.
Don't try this at home, kids!

Actually, are we sure the liquid nitrogen is actually hitting his hand? The point of contact is obscured by vapour. I mean, I'm familiar with the effect, but can also believe that a big stream of liquid nitrogen is gonna hit you and it's gonna hurt.
Hi Jubos,

I dont know how to contact you/message you on HN but there's one thing that has gotten a little annoying on spool; when you get to the bottom of the article - it brings up a big spool banner and this gets in the way of finishing up reading the article. I'm not sure if this is a bug or a feature but it's a little annoying :-/
Why Your Startup Needs a Vision
Exactly. As Steve Jobs is quoted in the article; Dropbox is only half the solution.

Apple's 'full' solution involves the necessary purchase of their hardware and software as well. Dropbox works across the board, without prejudice.
Mesa OB Gyn
You know we already have maglev trains, right?
Adventures in self-publishing: Rejected from Google News
I initially read the headline as "What we don't know about electrons."

Could someone please post that article? It sounds far more interesting!
If you drive your bike like it's a car, motorists will notice you and pass you with a wide margin.

Where do you live that this is true?
Android and IDEA for the Eclipse Refugee
RIM introduces BBX platform for phones, tablets and embedded devices
Haskell frontloads type considerations and tests via a required, tightly-coupled type system. Dynamic languages backload them via optional testing.

In either case you still have to think about those issues when correctness is a requirement. When it isn't (ad-hoc analysis, prototyping), dynamic languages are more pleasant to work with. When it is a requirement, Haskell is uniquely powerful.

Problem is, many projects are subject to both requirements at the different times. Exploratory at the start, strict once the problem to be solved is identified. Know the tradeoffs and pick your poison.
This is the most interesting comment for me personally. Thanks.
That sounds interesting. Any chance the code is open sourced somewhere? I would love to read it.
If it requires lots of people to work (chicken and egg problem) you need to find a way to get around it. Some common ways that spring to mind are:

-Seeding: figure out a way to get data in there before the user experiences it. LinkedIn, Facebook, etc have you import contacts so you can instantly find your friends/colleagues/etc. Reddit used multiple accounts to post links themselves. Create the content or figure out a way to automatically populate when someone registers.

-Pre-Launch: Get a bunch of people interested and release it to a large number all at the same time. Setup a mailing list to collect email addresses and when it reaches whatever threshold you need, launch it.

-Launch at an event: depending on what it's used for, there could be an event which makes the most sense to launch at for people to experience it together. I think it was twitter that was launched at SXSW (my memory could be completely wrong about this).

-Launch and fail: probably the most likely outcome if you've not engaged your customers at all. You can try it and get feedback for the next attempt to launch it, you need to figure out why people would want to use it in the first place. AirBnb failed how many times?
This is not a comprehensive list of Stanford free course offerings. For example, it misses the Stanford EE Computer Systems Colloquium (EE380), http://ee380.stanford.edu. The website has archive of videos going back to Fall 1996.

EE380 is a colloquium not a course, but many of the videos will be of interest to HN readers. In addition to the archived talks, which can be viewed on-demand, it's possible to watch the current (W4:15-5:30 Pacific) in a real time webcast or attend live in person. A significant number of “not students” attend live because there’s always something that the camera misses and because you can ask questions.

The talk this week (Oct 19, 2011) is Professor John P. Weyant, MS&E, Stanford speaking on Integrated Assessment of Climate Change: dealing with massive Complexity and Uncertainty.
It's very common (not to say it's right) for governments to actively engage in protecting the interests of companies based in them. Microsoft is no exception.

http://wikileaks.org/cable/2007/12/07SAOPAULO1001.html

Neither is Boeing:

http://wikileaks.org/cable/2009/01/09BRASILIA41.html
I took that picture I assure you, and he wasn't wearing gloves nor any kind of protection.
As the author of the original piece, it's hard to disagree.
wait for Google, Facebook or Microsoft to implement their own Dropbox clone.
No, I got shocked. I happened to watch the movie only a week ago. With the masks, the Occupy movement would look like the movie.

I hadn't noticed any clues of agitation. Now the movement looks like a terror, rather than a protest...
It's true, and we could always use more development help if you're in dc @catalist.us among others..
I've done a number of rollbacks in my time (for enterprise banking systems). They work so long as you do a few dry runs first and have an audit system in place.
Sensationalism aside, reducing HDD capacity by half, removing wifi, removing a whole bunch of educational software just to pay for Windows? Just. Wrong.

EDIT: Although, I don't completely buy the argument about upgrades. I still have laptops running Windows XP that work great.
New Software Creates "Self-Defending" Android Apps
one has to wonder if Dropbox's fate may eventually be the primary storage of pirates

That's further reinforced by the existence of Dropship[1] (although I don't know if it still works), which enabled people to get copies of any file in the whole Dropbox network with just its hash, by taking advantage of their deduplication techniques.

[1]: http://forwardfeed.pl/index.php/2011/04/24/dropship-successo...
Unless I'm misunderstanding your meaning, I think you may be trying to disprove the existence of, among other places, prisons?
DOCOMO Chooses Couchbase NoSQL Technology
Cybersecurity breakthrough keeps sensitive data confined in physical space
Obama better get out quickly before he gives them one last bailout.
Show HN: DrawWith.Me - Free Drawing and Sharing with WebGL
I love dropbox - and I just recently switched to a paid account.

I have gotten my whole team on it - we have a virtual team of 10 consultants all working from our homes. Dropbox is key to keeping everything between us shared.

We haven't yet gone for the Team account - but we will be doing so shortly. It is expensive - but the simplicity and value it offers it (so far) unmatched.
> Any man heading the company that has a product to sell can do what he did.

I disagree.

If the CEO is not a part of the equation, then either the engineers and designers at Apple just somehow randomly turned out to be just better than everyone else, or he IS part of the equation.

Nobody in the media is arguing that Steve Jobs drew up the iPod design on some graph paper and told people to build it. Everyone is praising him on his ability to work with engineers and designers to improve products and prepare them for consumers. That, and the ability to say no to stupid features tacked on by the builders. He is praised for knowing what customers wanted, before they knew they wanted it.

I can't imagine Steve designing the original iMac from scratch, but I can imagine him getting his team together and saying: "Consumers need a beautiful machine that they can take out of the box and turn on with no headaches or setup and connect to the internet. Let's make it happen.". THAT is how Steve thought differently.

I don't know how this article made it to the front page. It's uneducated flame-bait.
General bonuses don't get payed out until end of the year. The actual disbursement doesn't usually occur until well into the first quarter, although the record books probably reflect the bonuses in the fourth quarter (not sure about this).
New: FreshBooks for Gmail
This is where I'm trying to get some advice from you ;-)

Each newsletter is focused on a topic or natural collection of topics. What source is more focused on, say, Ruby than Ruby Weekly? I would find this useful advice! :)

Or are you saying you'd rather see, say, 3 or 4 links a week related to a topic.. and it's a problem with the volume rather than subject "focus"?
One of the things that makes a typical Linux install better is the preconfigured programming environments on it such as Perl or Python.

Unlike Windows 7. It would be so nice if Microsoft installed Visual Basic Express on all Windows as a matter of course.

(Of course, this carries with it the presumption that creation is better than consumption, and to really use a computer, you need to be able to program it).
Why is Mayor Bloomberg Talkin’ Trash on Boston at Techstars NYC Demo Day?
Rep.licants.org
Like a homemade porn? ;) Or documentary of a lecture
I love Dropbox, but Jobs is right -- they are a feature, not a product.

They will be relevant up to the point where operating systems simply makes their functionality a native element of their file system.

At least Drew is wise to the fact that they could become an also-ran, so it's not like this will happen to them overnight.
> (pronounced like the New York City street, not the Texas city)

What does that mean in non-US-English?
Ways your schoolteachers sabotaged your business writing
Many were expecting more and may hold off for the 5. Sari is good for the first elitists that want to show it off, but people want to use their devices quietly- not talk to them. Although many don't want to admit it, it was a bad idea. When you have Gizmodo post a link to a Hitler video making fun of it immediately, you know it is bad. Not to be callous, but Jobs death probably spurred a lot of buying. That probably won't sustain.
Hey HN! We just officially launched with a big set of updates we pushed last night. We'd love your thoughts and feedback.

Here's and example of something an early registrant made with our tools: http://drawwith.me/kyle/23-Can-I-be-Frank-with-you%3F . And our update just made a number of improvements to the drawing tool.

We'd like to bring high quality drawing/image editing tools to everyone for free, and make it easy to create and share using them. Let us know your thoughts!
Holy crap, its $25 a year. That is a bargain.
I pay $49/year for 10GB. Dropbox doesn't advertise but if you request it they'll quote you for other storage amounts and let you sign up.

20GB for $49/year is what I really want. Hopefully they'll do that soon.

Here is what they told in late 2009 - don't know if these links still work:

Thanks for writing to Dropbox. We recently ran a market test for intermediate plans that has ended, but I can still offer you the plans:

- 10GB $4.99/month or $49/year
- 20GB $6.99/month or $69/year
- 25GB $7.99/month or $79/year

You can use the following links to sign up for one of these plans. You need to be logged into the Dropbox website for them to work:

* 10 GB: https://www.dropbox.com/upgrade?plan=10&v=11396bf
* 20 GB: https://www.dropbox.com/upgrade?plan=20&v=e6ad6ff
* 25 GB: https://www.dropbox.com/upgrade?plan=25&v=9fb5a23
Future of Blogging: Individuals or Teams? MG Siegler & co...
If you're looking for compensation information from the company's quarterly statement:

Compensation and Benefits:

The accrual for compensation and benefits expenses (including salaries, estimated year-end discretionary compensation, amortization of equity awards and other items such as benefits) was $1.58 billion for the third quarter of 2011, a 59% decline compared with the third quarter of 2010. The ratio of compensation and benefits to net revenues for the first nine months of 2011 was 44.0%. Total staff levels decreased 4% compared with the end of the second quarter of 2011.

http://www2.goldmansachs.com/media-relations/press-releases/...
>could bridge the iOS and Android systems for app development.

How would it do that? Can it compile to Dalvik and iOS or something? Not very familiar with Go yet...
Killing the Abraham
Narrow band electronics are a whole lot easier, and with a lot longer history. Source power is also easier.
I honestly don't know. This physical resolution is basically the same as the (smaller) display on the iPhone 4. And while I don't use one daily, I honestly can't tell the difference between that and the 30% larger pixels on my Galaxy S. I think we're well beyond the point of diminishing returns.

I guess the iPhone resolution could be justified as an integer multiple of the original screen dimensions. And this one matches existing HD video streams, so it makes sense there. But in terms of raw pixels, I think only eagle-eyed teenagers are likely to see any usable benefit from these numbers.
Looks like they might amortize the bonuses over the year though?
China's Rise Isn't a Certainty
Huhston, not Hyousten.
mark multiple emails = O(n), mark all = O(1)
The book is expensive. On the other hand, it's a rounding error compared to the cost of the time it's going to take to get through the book.

For whatever it's worth, PDF versions of the book are all over Scribd. I bought it (twice) but am actually working from a "stolen" PDF.
Wait for competition from Google, Facebook or Microsoft.
Indeed. However I do like the fact that Perl6 macros & functions use the same calling syntax and so are often interchangeable.
Same thoughts here, it might make low budget special effects possible?
Houston the NYC street is pronounced "How-ston" whereas Houston the Texas city is pronounced "Hew-ston".
HOW-ston not HEW-ston
Gartner Identifies the Top Strategic Technologies for 2012
I thought it was about electrons too :)
But I think post about elections was fantastic.
Kred: It's All About Influence, Outreach and Community
> Did you read the article? It's not about "traction", it's about having that sticker or not:
"to distribute machines with the Windows 8 compatibility logo, they will have to implement a measure called "Secure Boot."

Read the article. Windows 8 still a year away (or more). Microsoft right now is shooting ideas in the air. Will this really mean that Windows 8 will force it for real? Who knows. That is exactly what I am saying. I don't think this will get traction enough to get implemented. If it gets implemented, yes, probably it will have to get traction, that sticker will make sure of it.

Microsoft right now is far away from releasing Win8, things like this popup every time they are releasing a new version. A lot of them get dropped. I believe this will get dropped.

>> RMS has tainted enough for me.Consequently, Secure Boot is OK :-)

Nop. Secure Boot is not ok. I just don't trust the FSF any more.
IPhone keylogger can snoop on desktop typing
We're not going to run out of minerals. Choose a mineral, any mineral, even a trace mineral. Look on Wikipedia to see what percentage of the earth's crust it makes up. (for example, iron is 5%). Do the math and realize that we've got thousands to millions of years worth of minerals left.

Sure, we can run out of "easy" deposits. We did that for Copper decades ago. Copper mines today are essentially giant processing plants that extract the tiny amount of copper in pretty much ordinary dirt -- "copper ore" these days only has about 10 times as much copper per kg as the stuff in your backyard.
Can you import/export it losslessly? I don't think so.

Apparently not: my students occasionally use Google Docs to get papers from their computers to printers in the library (or vice-versa), and the formatting of their papers constantly gets fucked up. When I see weirdly formatted papers, the students almost always blame Google Docs. Granted, I don't know if that's because the students don't know what they're doing or if Google Docs is hard or confusing to use, but still.
What about a different meaning of scroll, like making a side-scrolling game and calling it scroll.
Letter from the Founders: learning about communicating from Google's founders
Automobiles To Be Biggest Mobile Device Growth Area
Motorola Razr Unveiling [LIVE BLOG]
Leadership and the Lone Fish
Ubicacion hotel en girona
Hip and Knee Pain
It says they now have 2 video compression formats but doesn't mention the data rate or format. Anyone know?
Using passwords is like buying a regular lock, knowing full well it is both pickable, bumpable and impressionable.

Most startups simply ignore security or figure they'll do it later, leaving their customers vulnerable. This is a really shitty externality. :(

Users:
1) Use a unique password per service.
2) Don't store them nearby.
3) Enable all two-factor authentication mechanisms (AWS has a Gemalto fob, Google has mobile apps).

Startups:
1) Support hybrid OpenID+OAuth (makes it someone else's problem, true.)
2) Audit early, both internal and external.
3) Set an example for your organization by practicing good security hygiene.

Innovators:
1) Passwords suck. Let's get rid of them with an opt-in, non-profit identification provider (cross-platform USB fob, usable SDKs for A3E open standards) dedicated to providing independent, private, provable security (sans theater) for the benefit of everyone (even corporate). (Board members: security peeps, eff, etc.)

Basically... make auth{entication|orization} easier and more secure (not mutex) for end users to signup/login to services and manage app-app permissions, increasing conversation rate.