skysight-inc/HackerNews huggingface dataset:
That $20 trick is something I have been doing personally for a long time (can't anymore with the Nexus 4).
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I think FDI in e-commerce and retail sectors is something that will come to pass in India.

Its inevitable.
Ask HN: What is a good open source mail server for Linux?
I have been looking around and want to setup my own email server for my domain. I am running an ubuntu box for a server and want to install a mail service that is easy to install and allows for multiple users that can be created on the fly. I have looked into dovecot and postfix but whenever I try and look up a good tutorial, people are using postfix and courier or some other program.

What would you recommend for a good open source mail server that uses IMAP and SMTP so I can setup a webmail client and use Thunderbird on?
I didn't even take this into account when purchasing my home ... I made sure to buy within my means regardless of possible tax deductions I get to maybe make in the future...
The Wikipedia article at https://en.wikipedia.org/wiki/Flywheel_energy_storage claims that, in comparison to batteries, flywheels are not as adversely affected by temperature changes, can operate at a much wider temperature range, and are not subject to many of the common failures of chemical rechargeable batteries. They are also less potentially damaging to the environment, being largely made of inert or benign materials. A flywheel can potentially have an indefinite working lifespan. Flywheels built as part of James Watt steam engines have been continuously working for more than two hundred years. Another advantage of flywheels is that by a simple measurement of the rotation speed it is possible to know the exact amount of energy stored. Flywheels with Magnetic bearings and high vacuum can maintain 97% mechanical efficiency, and 85% round trip efficiency.

Why aren't these in wide deployment yet as local storage for renewable energy sources? The biggest problems seems to be overall mass, cost, and space efficiency. None are great concerns for long term energy storage solutions for off-grid buildings. In short, these things sound fantastic. Anyone know where to buy one large enough to store power for a small draw, solar sourced home?

This site explains a lot more about the concept, and engineering considerations behind two functional prototypes: http://home.earthlink.net/~fradella/homepage.htm

Flywheels in vehicles were the subject on an article in the Economist in late 2011: Road tests have shown that, thanks to modern materials and clever design, a flywheel as small as a hockey puck can reduce fuel consumption by more than one-fifth. In electric hybrids only 35% of the kinetic energy lost during braking is retrievable. With flywheels more than 70% is. http://www.economist.com/node/21540386

And someone just got funded on Kickstarter: http://www.kickstarter.com/projects/1340066560/velkess-energ... .. they claim Energy storage flywheels have been in use for over 100 years and are some of the highest performing energy storage technologies ever developed. Traditionally, they have suffered one fatal flaw... they are extremely expensive! Velkess has invented a way of making energy storage flywheels at such low cost it will be dramatically less expensive than even the most economical energy storage technologies available today. Phys.org discussion of this effort: http://phys.org/news/2013-04-velkess-flywheel-flexible-energ...
"We said, 'To heck with electromagnetic, we're going with electrostatic,'" Post says, laughing.

It's clearly not just a normal flywheel, perhaps it can convert some other energy form into electricity? (We call them "generators" don't we?)
The page itself doesn't make it sound like an overhaul at all- just a collection of minor tweaks.
Here are some very detailed mockups(?) on major platforms whose links are kind of tucked into the parent link:

Linux: http://people.mozilla.com/~shorlander/files/australis-design...

Windows 7: http://people.mozilla.com/~shorlander/files/australis-design...

Windows XP: http://people.mozilla.com/~shorlander/files/australis-design...

OSX: http://people.mozilla.com/~shorlander/files/australis-design...

I personally think it looks nice and welcome the update. I haven't really been using Firefox all that much mainly due to how busy the interface is, so maybe leaning it out will make me a regular user again.
it's not entirely clear what the value of --submit represents. i know that it's required and it's an account name on gh. i suspect it's the account of the target repo? if so perhaps it should not be required and should default to the origin, no?
> an area with lots of homes might be a good place for more businesses

That will be true even if the people who live in those homes are only renting. People need stuff, therefore stuff sells well where there are lots of people. Homeowners need just as much toilet paper as renters do.

Of course, if your business caters to people who extensively modify their homes, you might do better in a neighborhood of homeowners than in a neighborhood of renters. But the DIY home improvement industry only accounts for a small fraction of the total business opportunities that a neighborhood offers.
Oh dear. From the site:

>> If Google won't keep Google Reader alive, then lets get them to open source the code and we will run it ourselves! Who is with me?

It would be a heck of a thing if they open sourced Bigtable and {secret sauce flavor B} and GFS and Chubby and {S} to make that work. Of course, they'd probably also need {G} so people could log in and {K} to store all of the preference data. That would probably then force opening {C} and {S_2} too.

I once tried to get some takers to open-source {secret sauce flavor S}. I had a standing offer to deliver stacks of pizzas and appropriate refreshments to any team who wanted to take it on as a weekend hack project. By that, I meant I'd pay for it, drive out and pick it up, and deliver it and generally be helpful. I'd even sit down and bash out some code if they wanted. Otherwise I'd just worry about removing cognitive load so they could get their work done.

It never happened. Some would say it's because {S} is too closely tied to {L}. I'd say it's because everything is too closely tied to everything else. Little short of a purposeful rewrite to be lean and mean would do it, and who has time for that?

Oh, if only I could share the picture of the whiteboard showing how all of this connected. Spaghetti wishes it could be that complicated.
Should we trust Economists?
thanks for the insight.
The Valley conditions you to think startups either fail, get acquired up into one of the big players, or IPO itself. Everyone glosses over the idea of a company just being a going concern and making money. You continue to collect a salary, and your stock never sees a liquidity event.

SurveyMonkey will probably do well, but IPO? Only if they can convince some Wall Street types that they can cook the books in a Groupon type arrangement.
Derby is a slang for oral sex in the US? I've lived in the US all my life and have never heard that. Can't find that definition on urbandictionary either (at least not the first page of results)....
Its good to see that amazon has price similar to similar competing website, which is mostly $2-$5, rather than US standard price $10-$14. Compare the price of bestselling books in flipkart and amazon.in from http://www.flipkart.com/view-books/l327/ and http://www.amazon.in/gp/bestsellers/books/
And jwz gets proven right again [0]. I don't use Firefox as my day-to-day browser but every time I drop into it, I find that I have no idea where anything is. Hopefully they'll stick with the new changes (which do seem to be mostly cosmetic, instead of location).

http://www.jwz.org/blog/2012/04/why-i-use-safari-instead-of-...
That wouldn't help with housing prices. Demand is still reduced when grandfathered owners try to sell. That would definitely make it harder to move for a new job.
>>Is the Indian Post Office a major player at all

I don't think Indian Post Office is good option for courier stuff like a mobile phone, or a book.

But they are pretty good if you want to send a money order, letter or a registered post.
Ask HN: How do you write documentation for your public APIs?
Do you know of any good programs? Do you simply use a Markdown or RST document? Or do you know of something even better?

Thanks!
So... this is basically a really slow Fax service.
I don't think it's anything out of the ordinary. Attacks happen quite regularly, most are mitigated quickly and quietly.
There's no need to assume exactly 3 hexagons meet at each vertex: if you only assume at least 3 hexagons meet at each vertex, then 6N >=3V, and we get that the Euler characteristic is <=0, which is still a contradiction. Of course if you allow vertices with only two hexagons meeting at them you can make a sphere: for example, take two hexagons and glue them around the edges, then stuff the middle to get a hexagonal cushion.
Haha yep. It's above Rudy's in Palo Alto, at the Backplane offices.
shameless... i dont understand how these people can sleep at night.
I spend quite a bit of time analyzing lending data and personal finances.

I've also observed that when comparing a group of loans, those with homes were almost as likely to default on a loan as those without homes and it had minimal impact despite most people assuming that having a home makes a person "more stable." I have definitely seen many situations where a home becomes the priority over life, family and personal finances as well.

On the flip side, this argument also assumes that if consumers get better jobs, make more money, etc. that they'll actually save and/or invest more and the unfortunate reality is that most people just tend to increase their rate of consumption proportionately to their income/bonus increase.

So the nature of having a forced savings plan through a mortgage payment requires them to put money away yet still limiting their ability to move or take better positions.
I think it'd be more interesting next time if we not just arbitrarily pick the top 4 stories from HN sorted by points (because that's not always a good indication of the most interesting stuff).

Maybe we'll just pick our personal favorites.
Hmm... It seems the major factor is simply overbuilding.

"Overbuilding in one year leads to lack of building in subsequent years".

As building homes is a big cause of temporary job growth.

Also, I doubt long commutes lead to higher unemployment rates, as the economic pressures would step in. Companies hire to meet consumer demand. If they need workers, they'll raise wages, or open satellite offices where the workers are. They don't just stop hiring & let their production go down when they have orders.
That is a really cool site, and a really great idea! Nice work.

I'm curious why a "real-time" framework is needed for this type of app, though -- why not Backbone with REST? Is it so that you can view others' pages to see their habits/dailies/todos get updated in real-time...?
Have you looked into working with a property manager? They do all the screening and tenant management stuff for you. You give them a fixed percentage of the rent and I guess you're the wallet for repairs, etc.

Unless their take of the expected rent would result in a negative cash flow for you, it seems like a better option than selling at a loss.
I think they're just too damn big. Zynga should be a 100 or 200 person company. They'd be a very successful company with that kind of overhead. They simply scaled up far in excess of what their long-term business could support.
The article is from 1987 though, don't know if you noticed that ;)

The dictée is not as prevalent today as it was 20 years ago, and I don't think I have done one after the age of 11.
It's more like the world is going to be radically different place in 50 years, and owning property in a formerly 'important' part of the world doesn't quite have that cachet anymore...
FYI, these demos only work properly on Firefox.
> They need to be aware of the semantics of the option mechanism, how to specify whether a type is optional, and when that is appropriate.

Being aware of the semantics of the option mechanism is exactly like being aware of the semantics of null references. You've just agreed one is like the other with a default.

Specifying whether a value is optional is less complex than the usual way of specifying whether a reference can be null — a documentation comment. Comments aren't usually checked by the compiler.

Knowing whether it's appropriate for a value to be optional is exactly like knowing whether it's appropriate for a reference to be null. However, once a value is determined to exist, subsequent code can assume the value is non-optional, avoiding subsequent checks with no decrease in safety. Less complexity.

> They must also perform checks when converting values from non-optional to optional types.

Surely you mean the other way around?

Checking whether an optional value exists is exactly like checking whether a reference is not null. However, fewer checks are necessary. Less complexity.
Use postfix for your MTA for raw smtp. If you want open source web mail and everything fancy checkout either round cube or zarafa. Bonus points for zarafa for having iPhone / android / blackberry compatible active sync and outlook compatibility
Well, Great, how about more snappy and perf bugs land on 25 as well. Still waiting for SuperSnappy or e10s, or the new Necko work.

Firefox is slow ( Comparatively ) , I hate opening Chrome from time to time keeps reminding me how fast Chrome is ( Although that have gotten slower in recent release ).

Edit: And God they drop the Firefox Menu Button! Do they have to copy chrome on every god damn thing? What the heck is happening with Opera and Firefox UI design team?
I admire your courage for saying this.

For others, this is how it always happens here in India.

On the other hand when the books are priced well. There is actually sweet spot for which Indian consumers will happily pay. For example I can quote of Rashmi Bansal's books. Especially 'Stay hungry, Stay Foolish'. It was priced so well, I hardly saw any pirated books on the footpaths people were more than happy to buy the book.

Compare this to say with a book like "Seven habits of highly effective people' there was a time when hawkers on the footpaths would have something 100 copies always stocked because the original book was expensive and pirated ones sold like hot cakes.

You won't believe this, a while back I would visit Avenue road in Bangalore and one round with foot path hawkers could give you a hint on the best sellers in the market currently.
I'm a former NMR spectroscopist (a chemist who works with the same technology as MRI devices--though at even higher magnetic field strengths to in order to study the shapes of various molecules). I've quite spent a lot of time working around high-field superconducting NMRs without incident.

To clarify the the "nuclear" part, magnetic resonance technology does not in any way involve nuclear reactions or the ensuing radiation from such, so you can rest easy on that one.

Additionally, MRI also doesn't utilize any ionizing radiation in the scanning process. This is one of the major advantages of imaging via MRI technology as opposed to using x-rays in traditional radiography or newer CT technologies.

What happens in NMR is that certain atomic nuclei like to align themselves with the magnetic field that they happen to find themselves in, much in the same way that you might see iron filings on a piece of paper aligning themselves with the magnetic field lines created by a toy magnet. This is where we get the M, or magnetic, part of MRI.

When these aligned nuclei are then exposed to radio waves, they will absorb and slightly later, re-emit the signal at specific resonance frequencies. This is where the R in MRI comes from. Now the trick is that the exact frequency where this happens depends on how the electrons surrounding that nucleus are arranged (which is mainly a function of what other atoms might be bonded to the one yu're looking at).

The timing and frequency at which this radio re-emission occurs allows chemists and radiologists to determine various bits of information about the different environments that these particular atoms have found themselves in, making it a very useful tool for determining chemical properties or non-invasively taking pictures of the interior of people's bodies.

Around very high-field magnets (particularly the superconducting types used in research NMR spectrometers and high-resolution closed tube MRI scanners), however, you do need to be careful about the magnets--and what ferromagnetic objects you may be bringing near or into them and how the field may affect them.

I trust most MRI techs and spectroscopists understand the proper safety procedures around their machines well enough to not allow themselves or their patients to create hazardous situations involving the magnets. These are some delicate and very expensive machines. That being said, failures can be quite spectacular--imagine Magneto and Iceman having a battle royale in your lab.

I think this is quite enough for one post, I'll leave the medical risks involving contrast dyes and incidentalomas to those more knowledgeable than myself.
Does roundcube handle receiving the messages?
Yes. Probably much longer.
Why does it seem like everyone is moving to those curved tabs? They've always seemed like a waste of space and the overlapping bits make for an inconsistent tab UI.
If Apple spends the cash for NFL rights, I would hope that they can find a way to add playoff games, show preseason and Thursday/Friday/Saturday/Monday games, and eliminate all blackouts.

I don't care if the price goes up somewhat to compensate, but its absolutely aggravating when you're paying real money for this and you get a crappy product. There's no worse feeling than curling up to watch a game and finding out its blacked out.
Zynga had always felt like a fad to me. I just never saw any long term value. Oculus Rift though, there's a gaming company i'd actually put some money in. They have creative people, some kind of barrier to entry, and a real passion for the industry as opposed to a pirate mentality Zynga always seemed to exhibit.
>Nope. The writer sounds misinformed and is spreading FUD.

>I have successfully used Python's threads to perform concurrent database fetches, http page getters, file uploads in parallel. Yes, there was almost linear speedup.

It's not quite that simple - especially for the novice. Not every IO oriented library is thread safe (urllib2) and not every C extension remembers to give up the GIL, so no - threads do not always automatically get you increased IO throughput.

Worse - other languages do set you up to expect to be able to interleave IO and CPU bound code with threads. This frequently doesn't work well in Python. And finally - yes I have written CPU bound code and I think the techniques (processes, numerical libraries, Cython, alternative runtimes, etc) are sufficient to meet my performance needs it is a little annoying to feel that I'm giving up on 3/4 of the horsepower in my 4 core box by default...
Another good book on North Korea is B.R. Myers' "The Cleanest Race." While it's not focused on history or defectors specifically, it does offer unique insight on the formation of the North Korean state and the rationale behind its actions.
Nope, it's just a web-based IMAP client.
If I know I have that 20, I'll find something to spend it on pretty quickly.
I can't read it due to the pay wall so I must comment only on what is available.
So what would handle the incoming emails
Hi I'm Firefox and I'm trying to be just like Chrome. Maybe if I try hard enough I will eventually be indistinguishable from Chrome and then I can just give up and let Google push me out of the browser scene entirely.
Regarding your (2), I think you may not be aware of the vast scope of Earth observing missions (http://science.nasa.gov/earth-science/missions/).

Many of these are monitoring missions with data continuity constraints. For example, solar irradiance monitors are hard to calibrate, so missions need to overlap.

Also, they have a set of scientists that do calibration, who can't be told to go away and do something else for two years while a replacement is built. This kind of happened with OCO, and it was a bummer.
I really like using Restdown https://github.com/trentm/restdown

It's markdown with a few more conventions. Really handy.
> I haven't really been using Firefox all that much mainly due to how busy the interface is

Firefox UI is as busy as you make it[1]. It's very customizable without much effort. Not that it couldn't use a refresh but I quite like it the way it is.

EDIT: The commenters below get it right. Tree Style Tab[2] add-on is responsible for the tabs and you can remove the clutter by right-clicking the refresh button for example, choosing "customize..." from the context menu and just dragging all the unused stuff away into the box (a window that will appear). Toolbars can be hidden from View → Toolbars. Enabling integration with Ubuntu also thins it a bit.

[1] http://i.imgur.com/zdIy63Q.png

[2] https://addons.mozilla.org/en-US/firefox/addon/tree-style-ta...
Macbook Pro 15" Retina - good enough to be your primary workstation and I think it is perfectly portable (carry anywhere).
Introducing PlexConnect, an AppleTV client which thinks different
Dude it's 2013, Gumroad & Kickstarter only take 5%, Steam and others take 30%, Amazon and ebay take 11% to 25%. Online distributers are not record labels.

Your argument that "Almost none of the money that online distributors pull in (music, video, content vendors) makes it back to the actual content producers." is complete nonsense. It's no excuse to want everything for free or hate paid content. You really are a young entitled college student that wants everything for free. We all were. I was. Money was tight and went towards noodles and living expenses and we pirated everything because we couldn't afford it. Life changed, we grew up, graduated, got jobs, appreciate an income and now pay for things. One day when you bust your ass making something you'll appreciate someone paying you for it.
> [...] at least, I don't think it reduces to the halting problem [...]

It does. But the halting problem is solvable for specific instances, e.g. if you are writing the programmes.
Bill Gates Joins $35 Million Funding in Startup ResearchGate
Having to sit on five days' worth of unsellable phones would not be all that painful.