skysight-inc/HackerNews huggingface dataset:
$8 million per kilometer is about the same price as regular railway, so this sounds like a good alternative.

Maglev trains in general seem like great, cost efficient technology. They are generally opted against because they require a different type of rails. Given all the other high-speed train options, building a second rail network is nearly never worth it.

This leaves only inner-city transportation to maglev, where there are no shared rail tracks, and where maglev can shine with near-silent operation.

I don't really see how smaller train cars change any of this. You could build one-person train cars on regular train tracks. You would have to upgrade all the collision-prevention systems used by regular trains, but that's already being worked on to allow better track utilization.
Perl6 is such a completely different language and implementation that calling Perl5 is no different than calling Ruby or Python -- they all involve effectively embedding or calling out to the other language.

Here is a gist where I'm calling out to some Python. It is not done in the magical future way (which is in progress) of just doing "use matplotlib::pyplot:from<python2>" or similar, but not too bad.

https://gist.github.com/awwaiid/ef3f0abcfa96e34977b4

(I wrote this some months ago -- it can be a bit cleaner now)
Link to supporting paper: https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsd...
Interesting points:

* in-flight entertainment system devs allowed to run
open source
* system is "online" via aircrafts satellite
internet connection
* devs pushed fixes mid-flight

(Edit: The article headline is Aircraft customer experience on a new level)
They figured it out with one weird trick!
The problem with medicine as a case of providi g vastly more utility is that it hasn't. And most of the improvement has come from old and largely public intervenion not acute, intensive, personal treatments.

Most healthcare improvements, in the sense of longevity and mortality, came prior to 1920 or so, from municipal fresh water, sewerage, waste collection, improved nutrition, and public health methods (infectious disease controls and quarantines) and antisceptic and anesthetic advances.

Antibiotics and vaccines, among other advances, have ddone far less than these.

Even the advances since the 1970s are far more raising health standards among the least healthy, particularly minority men and women, than raising the life expectency of the best-served parts of the population.

Most medical expenses (nearly 15% of U.S. GDP) are simply not productive.
Faced with similar issues, I maintain a python library called python-usernames[1] with list of closed to 400 reserved words[2].

Publishing this as a library helps a lot collecting the wordlist over time and be able to use the same list in all my projects.

[1] https://github.com/theskumar/python-usernames

[2] https://github.com/theskumar/python-usernames/blob/master/us...
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This title doesn't give you any clue what the article is about, which is a shame because it's a good blog post about a musical road, and the errors made when building it, and about how to avoid those errors if you build your own musical road.
In Chinese medicine, the concept of 'QI' is roughly translated as the bodies organizational electric energy.

You can see an example of the qi directing an embryos morphogens to create a facial structure here:
https://www.youtube.com/watch?v=0VULjzX__OM

A great reference for anyone wanting to know how the ancient concepts link of with modern medicine and anatomy should check out the book 'The spark in the machine', recently released in the past year or so.
It is simply not possible. They know that, so they lie.
Forgive my skepticism, but Mr. Thiel did not offer to live near a reactor. For someone with his obvious intelligence, his oversight could not have been accidental. Does he fear the radiation or the decline in property value?

When a robber baron like Dale Carnegie wanted people to believe in his steel bridges, he staked his life and reputation and walked across the damned bridge.

Another major risk not mentioned by Mr. Thiel is a financial one, as it seems every nuclear project in the West at least has become a boondoggle. Even the project a few hours from my house - Plant Vogtle - where the state legislature generously transferred the financial risk to the taxpayers and customers - is behind schedule and over budget.

Until nuclear cheerleaders develop a taste for risk that will not be borne by others, maybe we should reduce consumption. If Las Vegas were to shut off 90% of its' outdoor lighting and fountain displays, would everyone there go blind and lose their enthusiasm to play slots? I doubt it. Just a thought.
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There are better ways to redistribute wealth. And I find your ">50%" statistic to be unreasonably exaggerated.
Begun the 'random acts of management' have.
> We already know that today’s energy sources cannot sustain a future we want to live in.

Is this really true? In Lazard's 2014 comparison of total cost per MWh, both wind and solar beat coal and nuclear [1]. Costs have fallen so much that it's becoming hard to justify continued subsidies [2].

[1] http://energyinnovation.org/2015/02/07/levelized-cost-of-ene...

[2] http://www.treehugger.com/renewable-energy/us-energy-secreta...
This reminds me of Cowboy (https://en.wikipedia.org/wiki/Cowboy_pool)

The table seems pretty small, anyone know the dimensions?
> We already know that today’s energy sources cannot sustain a future we want to live in.

Is this really true? In Lazard's 2014 comparison of total cost per MWh, both wind and solar beat coal and nuclear [1]. Costs have fallen so much that it's becoming hard to justify continued subsidies [2].

[1] http://energyinnovation.org/2015/02/07/levelized-cost-of-ene...
[2] http://www.treehugger.com/renewable-energy/us-energy-secreta...
You can also split your course into multiple parts -- part 1 can always have the $10 price, then the next part(s) could have the higher price point. This also gives the student a cheap way to sample your course to see if it is worth purchasing the higher price ones later on.
I was writing thread-safe code. But the fact I was using timeout led to the race condition.
APCu would not be enough at this level. Simply invoking PHP itself is enough to kill servers here. But yes, using nginx or vanish would have probably been easier and there's plenty of resources on it. In a case at my last job a single nginx instance handled 24k concurrent connections just fine.
That 2002 PowerBook G4 has a thinner bezel than my 2015 Macbook Air and the iPad...
Sure beats 'segmentation fault'
How I got permission to post VisiCalc (1999)
If you want to solve a recurrence, you can do that by assuming the general form of the solution (which is c*a^n for the above), or transforming it into exactly that polynomial you listed, you'd get something similar by using generating functions too.
Wait, what? Why do you think climate change is about wealth redistribution? Aren't you concerned at how much it will cost to protect all the cities on our coastlines if climate change is right? That's sure going to redistribute some wealth if we do nothing.
In flight entertainment systems have certainly been the cause of crashes in the past: https://en.wikipedia.org/wiki/Swissair_Flight_111

"the crash was generally believed to have been caused by faulty wiring in the cockpit after the entertainment system in the plane started to overheat"

It's not too far fetched to think you could end up with an infinite loop (or other random issue) in some inflight entertainment system code, causing it to overhead and potentially ignite. I'm sure there are plenty of safeguards, but they too could fail...and this is why we still have circuit breakers and a master switch in planes that a human can control. Sadly humans too can (and often do...) fail to make the right decision.

Any system other than flight surfaces, avionics and the source of propulsion to an aircraft add some degree of risk that we could otherwise fly without.

Edits: Spelling and general sillyness.
Cycling in snowy areas is actually common during the winter (30 - 40% of cyclists)[1]. It can also be a good transportation option when public transit is unreliable [1].

Here is a good guide for anyone interested in winter cycling:

[PDF] https://faridrener.files.wordpress.com/2011/09/winter-riding...

[1] http://www.cbc.ca/news/canada/winter-cycling-tips-1.3314804
Nuclear plants are also central points of failures, the plant itself needn't even fail, just the electrical distribution from it and you lose 1~6GW.

If they pan out, Small Modular Reactors (30MW~300MW range) seem like they could solve many of the issues with existing "large" nuke plants: the sealed core can be built on largeish assembly lines (similar to airliners in size) then floated, flown or driven to site, more units would mean more opportunities for automation and economies of scale instead the more pharaonic and necessarily more unique existing systems.

This would be further boosted by the inherent flexibility of SMR: they can be kept mobile (for emergencies, temporary setting, interim power, etc…) e.g. Rosatom's Akademik Lomonosov barge, which should have a total capacity of 300MWt/70MWe.
What student capable of creating licensable IP would be swayed by the arguments listed for using a license encumbered architecture? None (or, precisely zero).

You can take those two books and apply the basics to Risc-V, develop the same IP, and pay zero - and it's already being used in ASICs as well. In fact it's better if you've never been polluted by seeing the license encumbered works, to prevent any claims about originality.
SceneNet: Understanding Real World Scenes with Synthetic Data
This is fantastic! I tried to make something similar a few months ago and couldn't quite get it to work.
Also, it appears that a mirror of A/UX Penelope is still up, even after its original maintainer has shut it down.

http://www.aux-penelope.com
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In my country, green organizations, including the local branch of WWF are nothing more than extortion artists. They rally young, impressionable people by spreading FUD. They block ski lift projects and drum the media on all sorts of nonsense and broker their power to influence current political agenda or for money (when they run out). Most were created by ex-intelligence slightly before or after The Wall fell. It's disgusting.
I don't see the "geeky" aspect of it. It reminds me of golf + pool.. neither of which are geeky.
Just compiled the list and added a few others:

https://zimbatm.github.io/hostnames-and-usernames-to-reserve...

Feel free to use for your next PaaS !
For those looking to get started with Perl6 in Docker -- here is the related Docker Hub page:

https://hub.docker.com/_/rakudo-star/

And its GitHub repo:

https://github.com/perl6/docker
The life and death of Michael C. Ruppert (2014)
The problem is scale. Here is a really good analysis of renewable resources in the UK: http://www.withouthotair.com/

Conclusion: The UK doesn't receive enough sunlight or have enough wind/waves/tidal pools/land to grow food, power cars (of any kind) and meet other energy needs. The UK can never get all of their energy carbon free without nuclear or importing power. The US is in a better place because of solar in the Southwest but we still don't have the technology/infrastructure to transport all of that power.
Not really; the latter is usually followed by "core dumped", and some amount of useful information written to the disk.
What struck me was most is the ability to iterate quickly on features and bugs. They didnt just bring Node to the plane, they also brought a more modern software dev mentality. Node's ease of use and ecosystem are a definite asset there.

Most airlines are stuck with static, slow, and outdated in-flight systems. This will help them compete as consumers' devices have become embarrassingly better than the typical in-flight UX. Not to mention consumer devices are much heavier on bandwidth and power usage.

In regards to the other unsubstantiated comments in this thread, I would assume as an airline they also brought modern security practices along with the rest of the deployment.
That's only at level 1, until you realize Perl 6 code is parsed by a grammar written in Perl 6.

Its power is amplified by the part Perl 6 regexes are better than anything there is out there.

Even better, this extends beyond ASCII and applies to Unicode too. And will work with other powerful control structures.

I'd fix that date to something like 2027.
> second order equations are very common tools for real world modelling

... for example, in the discretization of the second derivative operator.
StandStand – The Portable Standing Desk
ISS has laptops. I've heard that they do everything by using Remote Desktop to a NASA box on the ground, but presumably there's some part of the client that uses a web view with some JS e.g. to show formatted text.
Coal plan produces more radioactivity than nuclear plant. There are radioactive elements in coal and they get released in smoke into atmosphere.
I'd say security is his biggest pain. Redis is insecure by default[1].

1. http://antirez.com/news/96
No that is simply not true, seg faults provide useful debug info in any potential core dump they provide.

Also, for something as important as an aircraft, I'd prefer to have a developer who knows what a seg fault is writing the code for any aviation equipment over someone who thinks "'undefined' is not a function" is equivalent to a seg fault.
neither are base line power. Storage solutions, as in batteries, do not make me think that the hazards of such large scale deployments of lithium based solutions to be better than more advanced reactor designs we don't use for political reasons.
I like how Thiel writes his sentences about safety, to avoid saying anything wrong. I invite him to spend the rest of his life in Chernobyl or Fukushima.

Personally nuclear energy is dangerous because when it goes wrong the result is really bad.

And the source of error is infinite, human, software, design, terrorists, war, civil plane, drone ...
Part of the appeal of technology like this is that it capitalizes on one of the few empty volumes of space in already crowded cities. Underground is limited by existing infrastructure, the city streets are packed, so take from the airspace in between buildings.
I'm hoping for SPARK Ada or something similar: https://en.wikipedia.org/wiki/SPARK_(programming_language)
> What makes the joke relevant to the discussion is that this is the first thought on lots of people's mind: "gee, I hope they don't ever use it for the actual flying system".

That's the second thought for me. The first was "thank goodness the airline I'm flying intercontinental with next week uses Boeing planes at that route".
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I just deleted my account at udemy:

"Dear Udemy Company,

I read about your questionable practice of not fighting against pirated content on your platform and not rightfully reimbursing the original creators.
https://news.ycombinator.com/item?id=10638795
I am not willing to support your stance on this topic and will delete my account within minutes.

Good bye!"
I have heard that this one is used in many of the studies: http://www.amazon.com/gp/product/B00PCN4UVU/ref=s9_wish_gw_g...
You are probably right, although there is at least a grain of sense in it.

A lot of environmental issues are also social issues. This is fairly obvious in subsidence farming communities where environmental damage is caused by and directly effects normal peoples lives. In developed economies it is just easier to ignore the human factors in environmental damage and focus on the technical aspects of this. The activists are right to consider the social factors, but are certainly ham fisted and rely on the wrong metaphors.
When children are breached–inside the massive VTech hack
YC has two nuclear start ups: Helion and UPower. How are they doing? What is their path to prominence?
As a native English speaker who is hard of hearing, I can echo his pain with phonetics. I learned most of English from reading and writing, and I say a lot of words incorrectly. People I am talking to that do not know me well often treat me as if I am retarded.

I can imagine it is far worse for people like antirez.
Why not simply outlaw nonrenewable energy sources over ten years or so? Problem solved.

EDIT: Would someone care to point out why that is not an valid option? Lack of technological viability? Lack of energy storage technology or capacity? Ideological resentment against a political over an economical driving force for the change?
Why Hackers Must Welcome Social Justice Advocates
How is this all that different than simply raising taxes and trying to use that money toward the same end? While I have never messed with Forex, my understanding is that it relies on an ongoing seesaw between the value of currencies or other goods. Deriving money from Forex is really no different than printing counterfeit money. Neither one would deplete itself, but I cannot see Forex rebalancing global resource distribution with any down-to-earth principal. If you owned the entire resource pool on all sides, that would be a different story, but I don't imagine that's what you're talking about.

If I'm understanding your end goal here, I cannot see anything like Forex being of much help in balancing resource distribution. Even if everyone were using the same currency and pulling from the exact same resource pool, there would still be a great disparity in distribution. Just look at any big nation, and you're bound to see plenty of unbalance internally.
I'm on about it being behind 2 or more major versions.
> In my opinion one fact that made me so slow learning English is the fact that I started reading English without never ever listening to it.
My brain is full of associations between written words and funny sounds that really don't exist in the actual language.

Really good points on learning to speak before writing. Trying to learn japanese now, and I'm glad that someone told me to learn to speak it fluently before learning to write it.
nah, I remember both Wilson and Furber mentioning buying Apollos for CAD.
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Flexport is hiring a UI designer
And you made an account just for that?

That's a pretty low blow. Redis is insecure because it is designed that way, it is a powertool with a very specific role to fill and it comes with a very nice warning to that effect. If you use it in a way that's insecure the problem is yours, not redis'.

Compare with cooks knives, powertools (drills, reciprocal saws and circular saws as well as fun things such as plasma cutters, welding gear, chainsaws, hedge trimmers, lathes and mills) and other professional tools sold without any kind of license or requirements of proficiency by stores all over the world.

Each and every one of those can kill you, in a pretty straightforward manner. And yet, they continue to be shipped, insecure by default. Because their users will not be able to do their jobs if each and every one of those would come with the kind of safety requirements that we'd normally apply to say a toy for a toddler.

If you don't know how to use a tool like redis in a secure way then you probably have other problems besides.

You'd probably be shocked to hear that many cluster environments have a single gateway machine that is (usually somewhat) secure but behind that gateway the whole cluster is wide open.
PHP can easily handle thousands of requests per second, as long as each request doesn't do much. Fetching from a shared memory cache counts as not doing much. You would need to do before you initialize WordPress though.
Sloppy dev is a sloppy dev - whichever the language: http://www.safetyresearch.net/blog/articles/toyota-unintende...
Hey, this is great! Thanks for showing me this!
That may not be a very good analogy, depending on what the theorem actually says.
If the laptops run Windows between 95 and 7, then there's likely a lot of JScript and JavaScript running in things like Active Desktop, desktop widgets, possibly startup scripts and obviously inside IE. I'm not sure if all this stuff is still around in Win8+ though.

Also, please don't give them any ideas. It's enough that every other JS webdev company uses rocket-related imagery on their site, we don't want them to design actual rockets.

;).
I think that recent initiative by YC under sam to invest in startups that may herald breakthroughs in sustainable fission is a great start. This should lead to a healthy competition which so far has been missing since it used to be a government only venture for a long time.
I'm sorry but this is nonsense.
“Must” is a very opinionated word in the title, but I thought there was a strong point expressed in the post: Hacker culture is political ideology.

There is plenty to argue about which ideology it is and so forth, but it is not agnostic. Likewise, she enumerates some goals of open source that I think most people agree with--like meritocracy, learning-by-doing, and openness to contributors--although clearly there are very strong and sometime opposing views on how to accomplish those goals.

I rate this +1 for “stimulating my intellectual curiosity."
A great example of how a headline can tie barely related content into the latest trend / top-rated HN article to catch a few more page views / front-page votes... marketing!
Note, however, that Perl6 is a completely different language with a different set of standard libraries and ecosystem and pros-and-cons. You'd be as well off comparing Perl6 to Ruby as you would Perl5.
I know that HN has a "don't feed the trolls" rule, but I don't mind losing karma here, I'm going for it.

Not only your comment is off topic, it's also comment is short-sighted at best. Redis is a fantastic tool that helps professionals like me get work done. It's well designed, well maintained, well written (just read the source code), and is one of the few small open source projects you can introduce to big co without fearing upper management complaints.

So yeah, maybe it's not as secure as you wish by default, but I'm glad antirez has the priority sense he has, because it led to working software that you can easily secure in your architecture.

So no, I don't think security is his biggest pain.
I ran Interactive UNIX on a 16MB 386 in the late 80s, it was a nice OS.
I still use OS 9 almost every week on a Powermac 1999 . The reason is that my drum scanner requires a card/driver/app that wasn't ported to OSX and won't run under "Classic Mode". Everything works perfectly, including original keyboard and mouse!

[edit] Wrongly cited Rosetta, a PPC to x86 translator. "Classic" allowed OS9 apps to run on OSX.
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Are you sorry for not saying why this is nonsense?
> Forgive my skepticism, but Mr. Thiel did not offer to live near a reactor.

Living next to a coal plant is even more dangerous than a nuclear plant, are you suggesting we should ban both plants based on these considerations?
> simply

Browse the FEC website for contributions from oil & coal companies to 2016 candidates. That's why it won't be simple.
People didn't stop paying attention to chess competitions when AI beat humans. We care about sports not because humans are better at things than machines - for most things they're not - but because it's humans beating other humans.
This doesn't prevent duplicate event processing at all, just simultaneous event processing on a guarded resource, using a lock to serialize all access on that resource. It definitely doesn't have anything to do with scale or distributed systems.
Apparently Inline::Perl5 works well enough: https://github.com/niner/Inline-Perl5/