skysight-inc/HackerNews huggingface dataset:
The current use for Tesla Valves is in microfluidics. On the macro level, people generally use one way valves that have moving parts. To harness the flow of a fluid being acoustically pumped, I don't know what it would take.

You could make an array of them perpendicular to a plane. Perhaps, by etching them into silicon. On a macro scale, you could machine them with a CNC machine, or even with hand tools depending on your tolerances.

For sound, you energy density is rather low, so the material you wish to propel would have to be incredibly light. And you would probably have better luck trying to lift a plate of some super light material. The Tesla Valve is most useful as a device where you want to check the flow from moving one way.

Anywhere, where having a moving part is a pain in the butt, and you want a more robust system. When you're etching things into silicon, generally, you want to avoid have to make lots of tiny micromechanisms.

As a paddlewheel, it would probably not make sense to use the Tesla Valve. Turbines are well understood. If you want to make rotary motion, that's the way to go.
Gmail's keyboard shortcuts are really pretty nice. hjkl to move around, enter to view a message, y to archive, m to mute, r to reply. That's a pretty damn good start.

off-topic, it's a little weird how it's expected that "true hackers" must become ill at the very sight of a mouse.
Ouch. They wouldn't like the 3.9 TB of my last 16 month...
I mean, sure, he has a point. But no need to start name-calling.
Who would make money if this existed? Who would lose money? I have a hard time articulating a concrete benefit for Microsoft that would result from a gateway.
> If I had to choose between a pretty and easy to use OS (that lets me write programs in peace and not have to manually fix everything from Terminal), and the ability to manipulate my OS's "ls" command, I'd choose the pretty OS every day. I wish we could have both

Fortunately, you can: just use a current Debian on well-supported hardware. (Until a year ago I would have recommended Ubuntu.)

> I don't think that extra dot is that bad

There are a zillion things like that in MacOS that are just that little bit harder to use, for no good reason. Requiring five extra keystrokes in `top` to get an actual list of the top processes is another example. You can come up with justifications for why the roadblocks are there, or rationalize that they're not that bad, but they really add up.it

It's like Apple's vaunted relentless focus on user experience just doesn't extend to programmers.

> Also, you can install package managers such as: MacPorts[1] or Homebrew[2] or Fink[3] (I prefer Homebrew). Then you can install htop, iotop, ftop, and a million other unix apps.

If you're comparing MacPorts, Homebrew, and Fink to Debian or Ubuntu, I think you haven't used Debian or Ubuntu. I didn't realize iotop and htop had already been ported to MacOS, though. That's cool. Thanks for letting me know. Powertop, latencytop, strace, and dstat no, though, I guess?
For the (American) readers of the article, France can be an imaginary place where the parents use special techniques (described fully in the author's book, conveniently on sale right over here), and everything is happy and wonderful.

The part I liked about the sales job is the idea of supporting the child's autonomy ("Cadre means that kids have very firm limits about certain things -- that's the frame -- and that the parents strictly enforce these. But inside the cadre, French parents entrust their kids with quite a lot of freedom and autonomy.")

France is that magical place where the boundary line between kids' autonomy and parental authority gets drawn in the perfect mutually satisfying place.

(Not French, but love visiting France.)
Innovation without age limits
This analysis is spot-on. Especially when it comes to getting small businesses on-board. Groupon, one of the champions of local, spends massive amounts on educating and selling local businesses on the value of daily deals.
"My contacts list is a text file called contacts.txt. Works on anything. Can be grepped. My calendar is a text file called cal.txt. Works on anything. Can be grepped."

I really like the sound of that. Can you elaborate a bit on the format, or provide a couple of sample lines from each?
I probably don't have to point out to most readers that this is a lot more work than `apt-get source coreutils; apt-get build-dep coreutils`.
It is complex to fully reverse engineer Skype: http://en.wikipedia.org/wiki/Skype_protocol
I have messed with running my own email server from time to time, but it generally takes about a day before I get an email bounced back thanks to the overzealous IP blacklists--for instance, as I recall, all Comcast dynamic IPs are blocked automatically by Spamhaus. Great, so I either need to pay extra for a static IP which might be non-blacklisted, or I can pay for hosting and just hope that's not blacklisted. Gmail is big enough and rich enough to stay off the blacklists, I'm not. So I use Google Apps hosting, even though I'd rather not.
(I'm a first-generation Russian immigrant, raised by Russian parents predominantly in the US.)

There is no question, in my experience, that the number one problem in American parenting psychology is the idea that you need to always respond to the kids' immediate needs and to give them attention. It prevents them from learning how to intellectually stimulate themselves, or be alone for any meaningful period of time, both of which are absolutely indispensable survival adaptations for childhood and adult life. The best parenting for the average American parent I've run into is less parenting.

I also have the sneaking suspicion that people delay or refrain from having kids here more due to the implied premise that having them is a life-consuming ordeal that totally, completely dominates adult consciousness. It shouldn't do that.

Yes, having kids changes your life, but you're still you. You do not live at the pleasure of your child. When hanging out with adult friends with kids, it absolutely astounds me that they end up repeating the same sentence ten times because their kid keeps interrupting them, in a tireless quest for attention. If I did that, my parents would've belted me silly. I guess that's "child abuse" here. Either way, aside from a good spanking, the best thing my parents ever did for me was ignore me a lot. I probably would have turned out to be diagnosed with "ADD" or some other claptrap if they hadn't.
The Pima Air and Space Museum across the street is awesome. Highly recommend a visit if you get the opportunity.
Nitrogen dioxide is a problem, but at an industrial scale it's not a huge problem. Among other things it can easily be captured with fractional distillation (water, CO2 and NO2 have very different boiling points), converted to nitric acid and sold.

And aflatoxin (and others) are not byproducts, they are deliberately made by the organism, regardless of what it eats. A byproduct is waste that depends on the food source.
> we treat him fairly

What do you mean here? Your kid is not a neighbor you would have to treat fairly our not, he or she is your own blood, you love your kid, you don't treat them. That's a part of American education problem, kids are like clients, with rights and all.
Could this sort of technique also be done for shrinking caches sizes of apps that are photo-download intensive? I don't know if the size tradeoff is worth the performance hit to reencode files as they're downloaded and cached.
Those acids are very easy to deal with, just bubble them through baking soda.

The chlorine makes salt, and the fluoride can be sold to be added to city drinking water.
Why your job ad sucks (plus how you can fix it).
It's still a service which you have to maintain and there's constant config & upgrading required since some spammers are smart enough to test their messages with it first.

I've run SA professionally for modest (low hundreds) of users. It works reasonably well but it's a job and I'm not paid to do it personally.
To me, you came across as somewhat of an evangelist. You showed us how much better off you are because you no longer drink, and for all those reasons, everyone else should also stop drinking.

It's certainly possible to have fun while being sober, in fact I think that's how most people have their fun. The fun they experience while drunk is a different type of fun.

For example, your friends are holding beers in the pictures of your partying experiences. You got to experience their drunk fun. If everyone was sober, you may have had a different type of fun. Skinny dipping, for example, is probably a choice made most often when you're not sober. My point is that a lot of the sober fun you experienced, you have your drunk friends to thank for.
I disagree on most points...

1. It takes a few hours to set up, sure, but it isn't difficult – setting up a mail server on a *nix box isn't exactly uncharted territory, every possible aspect of it is documented to death on the web. And once it's up and running it takes practically no effort to maintain. Yes, even with spam filtering that keeps my inbox spam free, despite my address having been used in several public newsgroups and forums.

2. It's a matter of preference. I too use Mail.app primarily, but I like being able to SSH to my server and read my mail in Mutt. As nice as Gmail's UI is in many regards, it's useless for threaded discussions on mailing lists.

3. Err, ever heard of procmail or maildrop, among (many) others? This is one of the major advantages of running your own mail server, actually; Gmail gives you very limited filtering options, especially when it comes to mailing lists.

4. Gmail has great spam filtering, but I find my Postgrey + SpamAssassin setup to work just as well.
you should start with ruby!

Ruby on Rails (RoR) is very good
Thank you for the nice comment.

I do not use twitter, but you can feel free to tweet it. Just send the profits of the tweet to the FSF. =)
Thanks for the encouragement! “We are told that talent creates its own opportunities. But it sometimes seems that intense desire creates not only its own opportunities but its own talents.”
― Eric Hoffer
So the answer to "How do I find the source to the ls command?" is "click around a web site perusing long lists of packages, trying one after another in an effort to figure out which one the ls command is from, then manually download nine files one by one from http://opensource.apple.com/source/file_cmds/file_cmds-212/l...? Is that a fucking joke? If that's your idea of fun, go ahead, but I have a computer to do that kind of thing for me. I have an operating system with package management, not a hobby.

> You don't need a developer account if you just want to install the software.

Perhaps this has changed since the last time I did it, a couple of years ago; it did then.
Can you _send_ emails from your ADSL line? Mine are rejected since I have a semi-dynamic IP address.
Yes, it is. But on the other hand it is more discoverable. All I had to do is type "mac os x source code" in google search. It is a little harder to find out about apt-get source coreutils.

First of all you need to know about apt-get. Then you need to know that ls lives in coreutils etc.
I am not American. Also not a native speaker, didn't know how to describe it better. What I mean is we take good care of him, so he doesn't need to protest all the time. Why should he wake up screaming in the night if there is no issue? So either there is an issue, in which case he screams, we appear and try to fix it. Or there is no issue, in which case he also doesn't scream. It is no fight or power game, as with the "let them scream" school of parenting.

Of course he is only 16 months now, so I can not really make that many claims about the effectiveness of our parenting... Also kids just may be different, but I didn't see the french woman take that many samples, either (did she check the French suburbs, I hear there is a lot of troubled youth around).

Also, of course kids have rights.
Over the Hill at 35
Very cool, it would be interesting to build one (large) which would be wave pumped. You could cast it out of concrete I suspect. The idea being that waves would push into the end and then the flow back out would be self resisted, this would allow the wave energy to pump seawater up a bit. Then you provide a drain which runs through a micro-hydro station.

Would be fascinating to see what rate of wave action you would need to keep the flow going up hill.

On a pure art level building a pool on the beach that was filled with wave action like this would be kind of fun.
You are not seriously comparing CMD.EXE with gnome-terminal and bash, are you? Come on.
The maintenance time this setup "costs" is recovered in less than a week of not having to click through the slow gmail interface.

Nothing forces you to use the Gmail interface to use their mail servers, though. I certainly don't, unless I'm away from my machine.
You do make a valid and important point. It does, however, point to a flaw in their recruiting process. They should expect portfolios, and not degrees.

Heck, I know two CS graduates who work at a local fast food restaurant.
Thanks! If that is really his point he should state it because I agree with you, and if this is his point, I would like to argue against the claim. But since he doesn't say what it is he is asserting, one can't even argue against it very well because the obvious rebuttal would of course be "Well I never said that." Such a passive aggressive article really has no place here if that's the case!
The purpose of Skype is to have a monopoly on the namespace and interop threatens that. Realistically, don't most people use SIP with phones that can only dial numbers?
Museum finds ‘stunning’ Mona Lisa copy
> Control over your own data means you own it, you have it on your hard disk,

As a self-respecting hacker, I was able to put in a 'getmail_fetch` call to my crontab.
Ah,rachelbythebay, you caught him for being "technically incorrect". Which, depending on how you look at it, is either the best or worst kind of correctness.
Yes, good point.

Plus, if you are google/facebook/apple material[1], then a degree is just icing on the cake for them.

Building something that gets a lot of attention is also very attractive to these types of companies.

[1]Whatever that is.
You make great points. Many games like Myst are doing well as mobile apps. Somebody has to own the rights to these old titles, right? If a company folds up and doesn't sell it, who owns the IP? I don't know the answer to that. Without a solid answer, perhaps even original creators can't do anything with it.
Table Model Inheritance in Node
There's no privacy in either case. Every single email passes in clear text through some ISP who may very well be storing copies of them. If you want privacy, you use PGP.
Exactly.

When there are so few good hacker out there, why take a chance to miss out on one?
How so? The application does the encryption, not the OS.
I agree, especially as a blog post with such a list.

This seems dangerously close to a case where someone is listing the home addresses of animal lab researchers and whether they have been assassinated yet or not, then puts "this page for informational purposes only". It seems like the person might be advocating criminal activity, but then has some wishy washy words to cop out on taking responsibility for it. Stating what his purpose is in posting such a list would clear up a lot of questions.

Maybe he is calling for more companies to establish royalty payments for artists and developers on the project, much as hollywood does for their projects. If that's the case it's a great idea! But who knows, it's just a list, being passed around the internet. It's certainly true that some are claiming it's an invitation for them to take the games without paying. That may even be the most common interpretation. If he didn't intend that, he should clear up the misunderstanding. Along with explain his sources other than to say they are secret.
Buy new Apple iPad 2 Wi-Fi 3G 64GB for only $110.76
Don't miss out!,, Buy new Apple iPad 2 Wi-Fi 3G 64GB for only $110.76 from www.ezy-bid.com EZY-BID auctions online for cheapest iPhone...Hooray!!!
Most ISPs will let you smarthost out via their upstream mail server.
>> The chlorine makes salt, and the fluoride can be sold to be added to city drinking water.

Yes, because what our drinking water REALLY needs is more rat poison.
On the up side,in clinical trials, fluoride stops rats from breeding, so if the same effect is observed in humans, at least we will have an answer to the world's population problem.
So, I completely agree with you regarding the observable counterproductive nature of over-restrictive substance laws, but I'm curious why you put "problems" in quotes. I ask because I've seen a tendency in some cultures to feel that alcohol addiction doesn't exist, or that it's an issue that is severely overstated elsewhere.
technology is here to help us live better, so maybe there is an app for this in future? someone works diligently to study child habits from different countries - developed or not and categorizes parenting styles. As a user one can ask the app - which parenting style the action you just took for your child's demand/question fall under, which can help you determine future implications, whether you should have done something else (the app doesnt tell you....but knowledge and data can guide you). I would read these and feed my brain.
One thing is the official age limit. Another, and much more important thing, is the age when the parents start serving alcohol to their children.

My parents allowed me to have a small sips starting when I was 5. At that point in my life, I could not understand why adults wanted to drink such awful stuff when there was sweet soda. My parents have never said NO to me when I asked for alcohol.

Result? I learned that alcohol is something you drink in moderation, I've never been (really) drunk, I've never associated alcohol with rebellion or a necessity for having fun or having a diner.
"Still no"?

There was "Skype for Asterisk" for a long time, and unsurprisingly it's the first hit on Google. It was killed shortly after MS bought Skype. Life is hard when you buy into proprietary protocols.
(For what it's worth, while software unlocking is usually not a huge or dangerous affair, there is not currently a software unlock for any iPhone beyond the iPhone 3G.)
I don't have a key because no one has keys ;)
I've never suggested it's a free market. I'm just saying there are four vendors who you can chose from based on your feelings about price and quality. I'm just happy it's not three.
This mirrors what's happened with me over the last few years, I'm having some trouble with both parents. I'm 24, moving out soon, but stuck in the house for a few months before I can live with some friends.

My mom I have an extremely strong love for so I never want to do anything to hurt or upset her, but she has no tolerance, so it's very hard for me because I feel like I have to be the perfect child for her. She even has me fetching the paper or a laundry basket for her, it's not like it's a chore that was given to me, but instead I'll be walking by and she says, "Hey I need you to go get the paper for me" and there's nothing I can do. Some of my friends tell me, just tell her no, and I'm like, you don't get it, I'm not really allowed to tell her no, because it would upset her so much. She even frowns on me leaving the house for things except when she knows exactly where I'm going and why, and will pressure me into just staying put, so these days I hardly even leave the house because of her. I do really care about her, and that's why I put up with things about her that drive me crazy.

On the other hand, my dad's so much of a control freak I've had to cut ties with him. Three years ago he did horrible things, my mom divorced him, and I ended up not speaking to him, but he tries to force his way back into my life. He sometimes says, "Well I'm your father so I have a right to... use your car whenever I want to, visit you whenever I want to, tell you to do something whenever I want to." My relationship with him isn't just damaged, but is gone after the way he's treated me. Just the last few months, first he came to my graduation after I specifically told him not to, then he pressured my mom into giving information about me, by refusing to tell her necessary financial information unless she told him some things about me first.
Two notes: you appear to be unaware that gmail can be fully keyboard driven (press ?). Second, after years of using mutt I very, very, rarely miss the extra features: 99% of my use was doing things like viewing attachments or links, which is implicit to webmail
And even more specifically retail food service, one of the more regulation-heavy areas. Starting a small tech business is a lot easier.
> I'm not sure I want to live in a world where people help make one single (semi-popular) product and expect to live off it for the rest of their lives...

But you feel good living in a world where people who don't help make products expect to live off it for the rest of their lives, right?
And, considering the 3 countries ranked higher are the size of medium to medium-small US states, the USA would seem to be doing pretty well.
ubuntu.com is kind of interesting... http://colrgrabr.swissamigos.com/#http://ubuntu.com
Have you made a rotationally symmetrical version of that flow, or are you going to try to make flattened jet? The biggest problem I've seen with valveless jets like this are that it works great in 2d, but rectangular cross-sections don't do well under high-pressures.
Most anything you throw at them != doing it all.

You talk in technical terms, they do in business terms.

They want one hacker to solve all their problems.

My comment about the list of languages is not aimed at that specific posting, but about postings in general.
I believe Android is better suited for this case. Being open source definitely helped them choose.
Oh, right, I tried that too, they said they've discontinued that service years ago.
So tired of misleading headlines like this that pump up engineer ego... stop feeling better than everybody and work with people as good as you think you are -- or stop complaining.
Hollywood Still Doesnt Realize That The Internet Drives Popular Culture Now
I second this. di.fm is playing for about half my work day, and often when I'm at home too. I love the Trance and Vocal Trance channels, with forays into EuroClub, DubStep and Chillout Dreams.
Another reason to use breakpoints in the debugger itself, when doing client-side development, is that you usually don't need to refresh the page (well, you may have to, if the breakpoint is in a piece of code that executes only on page load). You set the breakpoint, trigger the action that executes that code (or call it from the console) and you're already debugging :)
3 Gig Plan users pay $10/Gigabyte of overage. I'm pretty sure AT&T has priced the overage such that they don't mind if you use more bandwidth.
I was at a comics store (Chicago Comics) yesterday when a pair of startup guys came in to pitch what sounded like a loyalty program. (I didn't catch the name, but they said something about users getting points called "pixels", if anybody recognizes it.) The owner politely but firmly brushed them off saying that he'd heard from a dozen similar startups and he was just going to wait a few years to see which survived and became worthwhile.

So there's a fourth reason: there's enough of these startups that small business owners are sick of you.
That's what I'm getting at. Have you tried using GPG? Most "security" products (or projects) have terrible usability.

Disclaimer: I work on a "security" product.
I think people object less to general bandwidth caps than to traffic discrimination. For example, Shaw Cable was accused of throttling Skype traffic but not their competing VOIP product.