skysight-inc/HackerNews huggingface dataset:
Learning is obviously hard to quantify, but some teachers are much better at inspiring and helping children to learn than others.

But that's a high bar. Currently the bar is far below that, with many teachers obviously phoning it in to anyone paying attention. They can't be fired, and that's the problem I was talking about. I went to an excellent public school, and I was tiered with the 'smart kids', so I generally had relatively good teachers, and some that were absolutely excellent. Even there, though, some were blatantly awful, and should have clearly been fired. I took a couple of non-"Gifted and Talented" classes, and the teachers there were a good bit worse on average. Some seemingly knew less about their subject than some of their students, and taught things that were just false in some cases.

It's demoralizing to have terrible teachers. A few terrible teachers, and it makes kids restless and bored during the school day. Talent/quality density is important in many organizations, and schools are no exception.

The stakes are a good bit higher, though. It's cliched, but the kids in schools do form the base of the country's economy a few years down the road, and if a high percentage of them can't do much more than manual labor or service work because they weren't inspired and decided that learning sucked, the US is screwed in the long term. None of the benefits of a teacher's union are worth the risk they're creating. It's really important that we not throw our hands up just because we can't objectively measure them. As dkarl says, it works in other professions.
That 'niche strategy' sounds exactly like the advice from "Crossing the Chasm", by the way.
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As a first-time founder, I can’t escape admitting that starting fetchnotes is an immense learning experience

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Ask HN: OpenCV and Php Facedetect. Is there another option than self hosting?
hello!

for a web app i will need facedetection software. after some research i found opencv (http://opencv.willowgarage.com/) and a php extension (http://www.xarg.org/project/php-facedetect/) that creates a wrapper for opencv.

my problem is that my hosting company does not install such extensions on my virtual server.

do you know any other options than a root server (which i would have to administer, update, secure,...)?

thanks a lot for your help guys, you´re great!

martin
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Oh right. I find this so transparent that I find it difficult to even begin to use the word propaganda. But I could be dangerously out of touch with "the common man" or whatever.

Basically, if someone tries to tell me something is bad and it's not a paper on PubMed, I don't really buy it. But I guess most people believe secondary sources.
Io is just shy of being 10 years old (http://en.wikipedia.org/wiki/Io_(programming_language)) so isn't that new though perhaps it's getting a bit more mention recently probably because of the book Seven Languages in Seven Weeks (http://pragprog.com/titles/btlang/seven-languages-in-seven-w...).

There have been a few discussions about Io on HN before. Here is one post/thread from last year: http://news.ycombinator.com/item?id=1538835
An Australian friend of mine mentioned that some time ago the British government dissolved the Australian government with a phone call. Can they still do that?
Those graphs should really be column or row graphs. Their is no such things as '7.5' characters, so it is kind of misleading. It would also make it much easier to see interpret information, like the fact that 16 is the longest password used. As for the Character Types, that data isn't even connected, so a line graph doesn't fits even less.
You're welcome :P

As long as the people who don't see it all as a joke are sufficiently contained, then yes, it adds breadth to a conversations of comments. Someone mentions Hitler, someone else is reminded of something clever the Germans do.
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while I second your feeling, Io is at least 8 years old, so not so new :)
Looks like items marked [dead] in HN will show up as zombie search results -- i.e., they get returned in the search results for the items collection but the discussion field is null.

For example: filter[fields][type]=comment&filter[fields][username]=pg

...the second result there has a null discussion field. Getting the submission title &etc. would be nice.
Can you explain what you mean about 'cleanest architecture'? Having written a content provider, service, activity, and of course used intents in the past few weeks (and for months before), I would not really identify Android as "clean".
So a hacker is someone who fucks up your website till you do what he demands?

I don't think this is a good example of what a hacker is.
Is there anything you can offer your active members as reward for sending out invites? E.g. Dropbox offers additional space for each successful invite and that helped them grow.
The phone carriers want control over your phone, they don't want you to be able to easily 'upgrade' without their junk in it; it is in-fact the reason why it takes so long. The situation is helped a bit when users buy phones and plans separately, although it is becoming less popular to do this in my country, I fear. This is what was so good about the Nexus One, Google pushed updates directly.
It would be a little more cumbersome to write, but the same effect can be achieved easily:

A a = new A();
try {
B(a);
return C(a);
} finally {
a.cleanup();
}

Transforms into:

Either<Exception, Result> ret;

A a = new A();

ret = B(a);
if (ret.isRight()) ret = C(a);

a.cleanup();
return ret;

Maybe someone can rewrite this even more cleanly. I can think of an easy-to-generate improvement containing a GOTO.
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This is kind of interesting for collapsing two solutions to the error-signaling problem that are usually seen as alternatives. Or at least, I think of them as alternatives, and they're often presented that way.

The classic error-signaling approach is in-band signaling through 'error' return values, but that has the problem of any in-band-signaling solution, clash between the control and data values. Two possible solutions are: 1) in-band signaling with a more complex (data,control) encoding scheme, in this case every function returning (value,error-code); or 2) out-of-band signaling. The simplest example of #2 is C's errno facility, with one global out-of-band error status system; exceptions can be taken as a more sophisticated improvement that implements local context, along with infrastructure to make it easy to specify error-handling policies.

But it's interesting to think of exceptions as syntactic sugar on an in-band-signaling solution, rather than out-of-band signaling at all (at least conceptually), with Monads wrapping the code to check/propagate the error signal.
could have been a field trip. could have been free ice cream day. maybe there was a deal for students. and yeah, people everywhere like crap.
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I cannot get over how beautiful that site design is.
Oh man, and I just coded essentially the same (with persistence through, for we need history) with CouchDB over the last 2 months. If only you'd have launched a bit sooner!

ps. Maybe it's me, but 2 hours ago your site worked great in Opera, and now the design seems broken. If you changed some CSS, then that might be it :)
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It definitely sounded like he pulled that number out of his posterior.
Apple is only "playing catch-up" to Android in terms of OTA sync and updates.

Android has been a mess for media and is only now starting to offer regular consumers the things they've had for years with iOS (movies, tv shows, netflix).
Real Python people are totally pragmatic about this - if you need performance, drop into C for critical routines and use Python to glue it all together. This is how NumPy works, you totally can do hard-core number crunching in Python and never need to actually know that it's C or FORTRAN under the hood!

Other language communities make a point of being self-contained and consider it a failure if you need to use a native method, but as ever, it's about the right tool for the job.
Similarly, when I kill my neighbor I'm a "murderer", but when I kill my country's neighbors I'm a "soldier". Such distinctions are important.

I would be careful trying to equate hacking into Sony with hacking into Al-Qaeda.
Because it is easy to forge a response from CCAvenue saying that the payment has been made

The IP from which this response comes should be an indication? Not 100% secure, but a useful heuristic.
Most early-exercise contracts have a time limit, on the order of 30 days or so. So if you quit, the company has a limited amount of time to buy the stock back, and if they don't, they lose the right.
But you have it mixed up too.

IE has had VML (not SVG) since version 5. VML is similar, but not the same.

http://en.wikipedia.org/wiki/Vector_Markup_Language
Why do people always think they can get away without at least consulting a designer?
Proved false by the same media. You don't see that happening in China very often. Of course there's a degree of influence but the absurd hyperbole involved the the farcical 'they're all the same' anti-american argument you see here and elsewhere is contemptible.
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This.

When you get right down to it, all marketing is finding an audience that someone else has, and borrowing it. If I'm buying AdWords ads, it's Google's audience, if I'm getting press in the NYT, it's theirs, if I'm putting up billboards in the middle of London, it's the M4's traffic into the city.

The key is threefold: 1. audience interest & profile compatibility, 2. clear conversion points, and 3. a UVP.

Breaking those down:

1. What you're pushing out, and the interests of the audience, have to be aligned. So if you're launching a new HN-style area, you need to know who your audience are (probably dissatisfied HN-ers, some people from Reddit, programmers etc), and identify where those people are (HN, GitHub, Engadget, Bit-tech, Twitter...) and how you can reach them (ad platforms, publicity on blogs that they read, referrals, recommendations from trusted sources).

Understanding your users is key, both in being able to find them, and being able to serve them when they reach you.

2. Know what your points of conversion are. Is it getting someone on to the site? Is it having them sign up for something? Registering an account? Downloading something? Leaving comments? Starting threads? All these things are valid conversions, but it's important to know which ones you want to look at, and which ones are just going to be distractions.

Also, what are you going to do with this data? How about setting up a notifier for your first 250 users, when you reach that point, so you can email them all in person and thank them for coming along? Think about what you want to do with the data you collect, before you collect it. Data without purpose is just time invested for no gain.

3. What's your UVP (Unique Value Proposition)? Why should people come to you instead of wherever else is available? Audience quality? Signal to Noise ratio? Curation of content? Design? Features? What's the benefit that you offer over someone else?

If you can't convey this clearly, you're going to have problems. It's rare to get something like Twitter's early days where downtime and a confusing message is overcome by audience enthusiasm and the community doing your messaging for you. Ensure that you know what you want to tell people, and how you're going to do it.

Hope this helps.
> At £69.95, it was cheap enough to be an impulse buy for most people

Not to detract from the rest of what you say, but I think you might have a skewed idea about how much spare cash "most people" had in 1981.
yeah I wasn't aware that Io was as old as it is, which makes my rash judgment all the more rash, but I still feel that way about many of the (relatively) new languages mentioned on HN every now and then
the simple use of "Either" does not instantly qualify something as "monadic"

you know what else is monadic? NULL pointers. oh wait, you know what else is monadic? unix pipes. you know what else is monadic? CPP. really old shit.

just because the word monad isn't everyday english doesn't make it a cool or even an interesting concept. it's just an awkward abstraction for something everyone already intuitively understands. monads were invented for the sole purpose of giving haskell a programmable model for IO, that's it. it's just a concept that's only useful for haskell programming, everything else already has an intuitive programming model for IO.

it's like building up integers to be this crazy complicated concept and then saying Exceptions are integers. awesome, good job, you've just found an equivalence, here's a pat on the back (psst http://en.wikipedia.org/wiki/Church_encoding). i guess i should expect these kinds of vacuous observations given all the BufferedManagerFactorySingleton crap code java slaves write.

you know what else is monadic? state machines. you know what else is monadic? imperative programming. wait wait wait! you know what else is monadic? JAVA ITSELF head explodes
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Wadler’s law of language design
I don't think a letter from 1976 best represents Microsoft's strategy from the 90ties or from today.
This came up during a discussion of Haskell’s comment syntax on the haskell-café list:

http://www.haskell.org/pipermail/haskell-cafe/2011-
June/092644.html
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Yes I also find it very aesthetically pleasing. And it's also very functional as well. For eg, see the search on the Reference page: http://www.iolanguage.com/scm/io/docs/reference/index.html

Steve Dekorte, the creator of Io, also uses same site design on his on website/blog: http://dekorte.com/
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I do like Adam Curtis' work, caught up on the first two episodes of All Watched Over by Machines of Loving Grace this weekend, lots to think about, which is a good thing

http://en.wikipedia.org/wiki/All_Watched_Over_by_Machines_of...
You'd be surprised at how many totally outdated pirated virus-ridden WinXP (or worse) installs are still around in developing countries. Sure, you'd only catch stupid wannabe terrorists, but I suspect that's a rather large fraction.
Should have used this http://elainerecipes.blogspot.com/2008/07/bombe-surprise.htm...
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At the RubyConf in 2003, I asked Matz (the creator of Ruby) what languages he was impressed with these days.

He said only one: Io
You should add some screenshots to the GitHub repository.
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O, yeah. You are very clever in borrowing someone's else audience, for example, giving nonsensical answers to the questions which addressed to someone else. ^_^
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I would say that, given how 'cheap', you could slowly increment the cost-factor over time. You could also ask a user to replace their password after a certain time period, or after the cost factor gets too 'low' - you can even allow the same password to be entered. Having a different cost-factor for every password is a bit of a logistical nightmare though.

The fact is that any significantly high cost factor is much better than md5, sha1 or any other normal hashing function, and should prevent password cracking for 5-10 years. This is a reasonable period of time.
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That is a very dangerous myth, IMHO. Sure, sometimes it's true. But when it's not, you're up the creek without a paddle.
So, what's the intuitive equivalent to monadic parsers combinators? (see http://www.cs.nott.ac.uk/~gmh/monparsing.ps which incidentally is a great introduction to monads). Similarly, now that I have some understanding of monads, I find myself wishing I could use them(particularly the State monad) in other languages to reduce the boilerplate.
Well, if we're talking about scale, there is a significant difference between needing 100 servers and needing a 10,000. As in, you suddenly have far fewer choices as to where you can physically put them! At that point, suddenly, developers start to look very, very cheap next to hosting costs.

If you just need to buy 2 servers instead of 1 then sure, yeah, developer time is more expensive than hardware.
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Probably the biggest reason why you shouldn't work for a startup is that the word "passion" seems to be so carelessly thrown about.
iCloud, dummy! Seriously though, I'm guessing it's a second partition.
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I've been to parts of Africa (Ethiopia, Kenya, Zambia) promoting Linux. Except for Ethiopia all languages there are written in ASCII, and English (or French) is sometimes the official state language and commonly spoken. However Windows is still massively used and massively pirated.
This argument doesn't stand for OEM devices. And there are many of them with no carrier customization whatsoever (current version of Samsung Galaxy S II), with slow upgrades and no "system components" upgrade.

Google is still pushing updates to the Nexus One and Nexus S, so it's not like it's the past.

By the way what I'm talking about is a limitation of Android itself: it has no package management system (with dependencies, upgrade etc.) for core components. And what I'm proposing would allow certain parts of the system to be upgraded while carrier junk stays there.

Google is actually already doing that for Gmail, Market, Music, Maps and other apps. Why not the browser ? (even if for now it uses a separate libwebkit)
Io is not very fast, even slower than Ruby.
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If you can make this argument, so can potential investors. It isn't a secret.
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This is actually somewhat of a complicated topic. The overwhelming expectation is that anti-matter has the same inertial and gravitational mass as ordinary matter does. However, there are some intriguing possibilities for matter that doesn't.

Consider what happens if an object has "negative mass" though. It would be repelled by ordinary matter. OK, simple enough though, right. But then what happens? Well, F = ma right? So the repulsive force would repel ordinary matter, but it would result in an attractive acceleration of the negative mass. Now, if it turned out that gravitational and inertial mass could be different, that would be an incredible result as well.
This is over-the-top and forgets more than a few things (e.g. almost every desktop e-mail client can be easily persuaded to send e-mail in the clear); nonetheless, the basic point is sound.

A more comprehensive solution - something along the lines of http://news.ycombinator.com/item?id=2047794 - would be needed, unless we are willing to reduce the internet to HTTP (well, SPDY, but that's basically the same thing).
"even more cleanly"

I think I prefer the try..catch..finally version - looks much cleaner to me.
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The IP will be the same. See my response here: http://hackerstreet.in/item?id=6737
With all the trusted root CAs pre-installed into most browsers, a governmnent that wanted to could easily take over their local CA, have a cert issued to them for Facebook, Twitter, etc. and man-in-the-middle all your SSL-secured connections as much as they want.
The problem with this approach is that you get exposed when a website stores their passwords as plaintext. Someone who was smart enough to notice the pattern in your formula could then use that info to get at your other accounts.
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