skysight-inc/HackerNews huggingface dataset:
Lithium-ion batteries are supposed to be pretty good as resisting self-discharge, losing only .3-.5% per day (or around 10% per month). The Tesla S has the 60 kWh or 85 kWh battery, so replacing around half a percent of that each day is 300-425 Wh. That's not much at all! If the battery replacement machines are simple and foolproof, perhaps home delivery of batteries and a small trickle charger could be a competitive model to full-blown home chargers?

Storing the batteries at the station will require much more volume than the analogous amount of gas/diesel. And a dumb tank beats a smart battery charger with software and EEPROMs if your concern is resiliency. Some EV problems are pretty clearly chicken/egg adoption problems. But there are some real infrastructure problems, too, and other changes may bear far more fruit towards the goal of more efficient energy exploitation.
I certainly don't think programmers need to learn math. The vast majority of programming requires no math, and there are tons of out of the box theorems and algorithms that can be used successfully by programmers to do wonderful things.

I am just pointing out why math can scare programmers away. The first step in overcoming that fear is to identify it.

And the fact is that programmers do need to tweak the algorithms they use. Your analogy with a car works perfectly: can you expect someone who only knows how to drive a car be able to convert a sedan into something that can go off road? Then how can you expect someone who only knows how to call a function to alter its contents to suit their particular application?

I also think that I haven't set a high bar. The basic four methods of proof is quite a low bar (this could, and should be taught in high school mathematics, and it baffles me why it's not). Learning common syntax will come as you learn.
I am not sure what the process looks like for legal persons, but from recent experience inquiring about and gathering paperwork to get my wife (a Japanese citizen) an ITIN, I was quoted six weeks by multiple authoritative sources, including my accountant and the IRS.
I'd like to add as a general side to this that it's very cathartic to go through the motions of this application.

For those who are like me, and have only just begun building their startup, if's enormously useful to sit down and do a few takes of an impromptu video, and answer each question on the application.

It is almost like an outside opinion asking the right questions to critique your idea and your determination. It allows you to think about your ideas and the challenges you'll face in ways you may not have before. Basically, it forces you to bring your idea down to earth from the clouds and think critically - and realistically - about it.

I second any opinion claiming it's worthwhile to fill it out even if you're not funded for this exact reason.
If you are on a student visa you are not allowed to get that money even if you had a SSN. You will be violating the rules of your visa. After you graduate, find a job and go on H1-B you still can't earn any money outside that job. No paypal, not adsense, no stripe. Eventually if you decide to apply for a green card these things will come up and you will have to leave the country.
It's kind of like list comprehensions in python. For loops do just fine, but they're such a pain to write all the time and for some cases we just want a clear one-line way to say "add 1 to everything in this list."
This is so rad. I like the idea of coating a boat with this stuff just to see what happens. Or the old greased watermelon in the pool scenario.
Looks great, and useful, wanted to share, but you are missing open graph tags so facebook share just includes your link, please add meta tags / og tags (like description, title, image etc) to make easy sharing, this is pretty important...

see here for more details: http://ogp.me
+1 for the book recommendation alone [1]. I finally see a book on set theory that explicitly states that the term "set" by itself is undefined.

Reading the first chapter preview at Amazon, I already see the need for a human to explain something to me:

Two sentences from the book [1]: "A possible relation between sets, more elementary than belonging, is equality." and "Two sets are equal if and only if they have the same elements". These already seem to be contradicting each other -- how can equality be more basic than belonging if the former is defined in terms of the latter.

While I agree with OP on the difficulty I face when learning advanced mathematics (notation, generally tacitly assumed by the authors), one thing that also bugs me is use of human language (!) as a part of the proofs. How do I know that the proof is correct and is not impacted by something fundamental about the language itself? Merely via inclusion of a human language in the proof, a lot more axioms "may" have been included than what meets the eye. Probably not, but I often find it hard to convince myself of this.

[1] www.amazon.com/Naive-Theory-Undergraduate-Texts-Mathematics/dp/0387900926
> Its futile to argue with them that vaccines aren't (statistically) harmful, they've already made up their minds

It's ignorance trying to defend freedom, backfitting the "facts" to their beliefs - the basis of most nutty theories. What they're really trying to defend is that government has no right dictating what one must or cannot put in their own body. But they lack the learning to be able to articulate and argue at this philosophical level (for if they had that kind of education, they'd most likely have ended up believing that society should be engineered).

It's not a good thing that these people don't vaccinate their kids and end up feeding them bleach or whatever instead, but one would be a lot better off trying to address the root causes of what makes them take an adversarial position against modern medical science, rather than wishing to paper over the symptoms with dictatorial fiats.

Also, I don't see how this is a very good simulation. As its rules are laid out, if you don't want polio, simply get vaccinated. Doesn't a large part of herd immunity have to do with even immunized people being susceptible under repeated contact with infected people?

Furthermore, it deviates from objectivity with an implicit value judgment that unvaccinated people either "cannot be vaccinated" or "are freeloaders", when it's really just individuals' utility functions. The problem with this assumption will be lost on those who'd like to engineer society, but it highlights the grave philosophical leap of the entire argument.
Have you read any of the comments here before writing your own? What is PayPal getting away with? How would another bank have acted differently? What regulation do you think applies to banks but not to PayPal in this situation? They are all beholden to the PATRIOT Act, and to the IRS; PayPal is also beholden to 50 different states' Money Transmitter licensing regulations. None of them want to be a conduit for international money laundering.
The TC article says their voting power is already only 25% combined (8% each)
As I said, if lawyers get involved Paypal will care very much about his immigration status. If his visa doesn't allow making money while in the US, he's just handed Paypal's counsel a very big stick with which to make him go away.
That is a huge amount to sell in one year. Wonder why he is unloading so fast. Why not a 5 year plan?
In Massachusetts it starts when you pay any amount of money.
Excellent, thanks, we'll do that for all future chargebacks.
The most popular coding languages of 2013
Wow I never expected to see an article about Don Rosa in HN. This is a really sad turn of events which I was not aware of. I grew up with Carl Barks's and Don Rosa's comics and thoroughly enjoyed each one of their stories, was inspired and moved by them. He leaves some pretty big shoes to be filled.

Thank you Don, for everything you have done and for being with me through all my childhood( and beyond) through your stories
The full $200,000 would cover, literally, 1.8 seconds of federal government spending.
No one knows who he is; however, there is speculation.

http://bitcoin.stackexchange.com/questions/229/who-is-satosh...
Yes. The lawyer is obligated to keep that information confidential, unless you explicity release confidentiality.

As soon as the lawyer realizes there's a conflict, which will often be fairly obvious, they're supposed to stop and explain the situation to whatever degree appropriate.
Pretty sure he does that too through the Bill and Melinda Gates Foundation.

Quick look at the wiki page says that among many global health issues, the Foundation hands out hundreds of millions in grants for AIDS research on condition that findings be public. It's notably also involved in the development of Malaria vaccines like RTS,S, the first anti-parasitic vaccine in history, I believe.
I'm hoping that we can just drive the rover over to take a closer look before very long. I can't guess whether this is the result of past erosion or the result of a past meteorite impact, or even some offthrow of the Curiosity landing that just appears to be embedded in the rock but really isn't. In any case, this seems like it will be educational.
I wrote everything from scratch. "Not invented here" might be a valid criticism in some cases. I don't know. I'm the boss. On the job misery due to libraries is at least a little relevant?
Don't see the comments in the article.
hahaha love it! Just like Macgyver :)
Your numbers are good. The landing page seems to be working well. Your payment form needs work. From experience it is one of the most crucial parts of your sales ladder.
What is Nemo?
The comments here are good.

One point not addressed in the comments is that whether PayPal ever gives you the money back or not, OP has earned $200,000 in income while in the United States and he owes the IRS and possibly the state government as well full US income tax on this amount since he was in the US at the time he did this work. It doesn't matter what his visa situation is, that has nothing at all to do with if he owes taxes. He is required to file an income tax return this year, and pay the taxes, end of story. If he doesn't pay the taxes, he might go to jail and probably will get a felony record and be permanently banned from returning to the US after release.

So this is a pretty serious problem and requires a legal team, which undoubtedly will cost the full amount on deposit to untangle.

He can't just walk away from the situation and let PayPal keep the money, unless he can get the amount he owes in taxes from a relative and pay it, which then puts him into debt.
SO THAT'S why websites scroll!

The purpose of website scrolling is to replace information that has been seen with information that hasn't - and to provide the reverse operation when scrolling the other way.

This design beautifully conveys the data visualization aspects of the page combined the message they are trying to craft and integrates it into the natural behaviour of the browser: the scrolling motif. Note that they also preserved the incremental change of the scroll - unlike some sites where they have attempted to flip a whole page at a time per scroll.

As far as re-inventing the scroll, I say bravo. This is truly innovative.
It seems to me that what you are measuring is how well marketed a movie is, not how good it is on any scale. Interesting point, compare your results against box office results.

Also: the hottest and sexiest movies #6: Ice Age??? :)

http://www.buzzscale.com/?page_id=4134#62458
This is awesome, brightened my day. Thanks for sharing.
Making people sit and wait for an hour whenever they need to recharge is just plain nuts. It makes the "road tripper" use case untenable. The right way to handle this for road trippers is to swap the battery packs or swap their contents. Don't make the driver wait while his battery is recharged - swap in a full pack and send him on his way. Charge the battery that was left behind slowly and at leisure, then give it to the next driver who pulls in needing a charge.

I don't care how many charging stations there are - adding multiple hours of charging time to a short trip like that is just not going to work.

Although there's one other conceivable option for a technical solution - if you could add charging circuitry to the freeway and recharge while driving, that would be a game-changer.
Found a solution:

Set up the query on hurl.it, click on permalink, then copy the URL it gives you, for example:

http://www.hurl.it/hurls/5a5762bfd067fe6c500f79f10db3c2a3166...

Every time you visit that page, the query will be loaded, you can send the request and see the response immediately.
After you get your money back, dish Paypal and use Stripe.
Sharing is Caring, Story of Photos Going Viral
PayPal allows itself to pull money out of a bank account associated with the account as required.
Absolutely! I agree with your whole post. I was meaning 'usually' in the sense of usual employer / employee relationships.

Most employee's do not know, nor know how to find out, their net worth to the company. They definitely do not get offered equity.

Most companies go to some lengths to obfuscate the earnings from their employees and contractually forbid their employees from speaking about their own earnings. Most employees, even if armed with such knowledge, do not have the power to demand their worth as there are a large queue of eager replacements for their position.

My point was essentially, if someone thinks they are trading off rewards / equity / ip royalties etc for job security, they probably do not have a good understanding of their relationship or value to their employer.

Don seems to have known full well what he was trading off, and as he explained when he drew the line and exercised his right to negotiate "they simply refused to actually ask permission". They refused to negotiate as they were so used to being in a position of power.

"But you've got to have enough skill to be of value"
I would say, you have to have enough skill to be of 'great' value.. then you have the power to negotiate or go elsewhere. If you do.. more power to you!
You know nothing of which you speak.
I wish we had shell script installers that are 1. easily proofreadable, and 2. served over SSL, like this:

#!/bin/bash
#
# Installs a product from the Internet.
# PLEASE READ CAREFULLY!
#
mkdir /tmp/foo-installer
cd /tmp/foo-installer

cat > file_2.sh <<________EOF_file2.sh________________________________________
A very long script here....

A very long script here....

A very long script here....
________EOF_file2.sh________________________________________

base64 -d > file2.png <<________EOF_file2.png_______________________________________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=
________EOF_file2.png_______________________________________
33K while I was in Venezuela. I had an old U.S. account, so I wanted to change it to Venezuela. My PayPal U.S. account had crazy address like: Avenida GRGRGR, Estado GRGR, United States. They said to me, you can't change the country, so you should create a new account. I did that, but once I noticed less features in PayPal Venezuela, I decided to keep the same code in my website and move the money from the U.S. account to the Venezuela account. I have 1% or less of chargebacks. My customers are happy.
Here's NASA's hi-res original:

http://mars.jpl.nasa.gov/msl-raw-images/msss/00173/mcam/0173...
I've benefited from lots of theoretical classes, and you're absolutely right that you need to understand the theory of what you're doing. For example, I took a lovely class from Prof. John Hooker (at CMU) that derived Linear Programming duality as a natural consequence of Farkas' Lemma, rather than just mechanically grinding through LP tableau. I certainly followed the proofs discussed in many classes.

However, I can honestly say I got that understanding without doing hardly any proofs of my own. Graph theory was the only class where I "did proofs", and I didn't find it my favorite. (Later I did algorithmic graph theory and network flows - and that was fantastic, with no proofs.)

I guess my point is just that an engineer can understand and use a lot of pretty advanced math without spending much effort learning about proof techniques. That certainly wouldn't be how I'd spend my time. (Of course, if you enjoy doing that then knock yourself out.)
1/2 a centimeter in height, natural feature.
The coloring on the Wikipedia picture is horrible and is essentially the equivalent of this optical illusion.

http://en.wikipedia.org/wiki/File:Gray_square_illusion.png
Very very impressive. Good job!!!! Thanks for sharing.
First off, ugly is in the eye of the beholder. I don't find it ugly, I find it nice and original.

Secondly, the idea isn't to push as many apps as you can in one space. That just leads to the paradox of choice. A smaller selection on the screen which is readable and not overwhelming can be quite effective.

I agree that a search box should maybe be present, but I disagree with most of this article.
Rich Hickey there too.
Sorry about what happened with you. The only why you could get the money is to had the PayPal account linked with one account in Venezuela instead of US. According with your F1 status (and mine) you cannot earn any money in US while studying, unless you get authorization from school to work out of campus (CPT), or after conclude your studies (OPT). Even under CPT/OPT you cannot earn money other from other place than the place you work on. Sorry, I wish you the best luck.
Intentions don't matter. I'm glad harthur was magnanimous enough to accept the apology, but that doesn't really change much.
If he's an international student, he's only allowed to work on campus. If he gets a US tax ID and files income under that, his library sales will count as off-campus income (I think?). So I'm not sure if this is an option. Of course, IANAL.
This is a bit of a double edged sword. Competitors will always make apps to compete, and with the app store, Apple is competing with other app makers. If apple is able to always make better apps than anybody else, and they only make them for their platform, developers won't build for the platform anymore, meaning less apps, and in theory more energy being put towards the other platforms.
I'd guess it's more like 2-20K, but if it were only that much would HN have discussed it?
They facilitate evaporation cooling of causes and movements.

Also known as "letting a hundred flowers bloom." How'd that work out for the "flowers?"
At 1:02:30 you can probably figure out his laptop password.
I'm not sure I got you. Are you saying Paypal can withdraw money from your bank account?
Bitter much ? Can you point me to some data for your claims and their accuracy records ? So far I have not heard of any real world testing (> 100,000 miles), with an impeccable safety record. Maybe there is and I am just missing it.

Maybe you underestimate the technical hardness of the problem and what world class big data and machine learning can do for such a problem with an enormous number of scenarios.

This is like going back in time and saying book opportunity is pretty much non-existent for Amazon. B&N and Borders know how to do books, have amazing distribution around the country and they are working on their online book stores anyway (which is not even technically hard to do)
Wow thanks for all your time and feedback. I really appreciate it. I'm going to add the price to the demo page immediately, great point. Im going to let the other points sink in a bit and figure out how best to implement them.

drop me an email if you want a complementary account at hv at ownzee.com You have been super helpful!
I agree with your comments about the politics, but I have one nitpick. 30F does not sound like extreme weather. Where I grew up, below freezing is normal for half the year. I am really curious how they are going to solve the problem of making electric vehicles work at -40F.
Good luck buddy. I can only hope you get all the necessary help. That's because I am not in any position to help you.
What is the source of that graph? Why does it only cover a period of about 16 years?
2013 Shahbag Protest
This means some major vaccine has been developed, and some major life threatening illness cured, right? Am I right?
MIDI "the first open software"
i did suggest you ask this question at Quora too
I could ask you same about reading comments...

If I am not mistaken a significant percentage of them seem to agree with me and suggest sweeping funds to an actual bank periodically.

I apologize if I somehow offended you, but I stand by my statement.
One post of my blog got some attention days ago. I unfortunately had to turn comments off for that specific post, I was quite insulted. I got impressed by the level of thought people were putting into those insults. Some of them went to my linkedin account to read an un-updated bio and used it to formulate the craziest theories about a post that didn't criticize anything, was just some info+entertainment.

One of the insults was so impressive that I actually emailed the person asking what the hell was that, he just apologized and said he didn't fully read the article.

I'm starting to think everybody is a bit schizophrenic.
Yes. I remember OJ Simpson's first lawyer refused the case. Didn't talk about the conversation and wasn't compelled to. But it was clear he refused the case because of the conversation.
I sincerely don't think there is a "pretty way" to make ~$60b. You're going to have to be willing to be a hard ass and take some unethical routes.
Regarding unreliable readings of remaining charge, I'm of two minds. Consider digital cameras, which use a similar battery chemistry. For more than a decade, Sony has for some reason been basically the only manufacturer whose cameras produce a fairly specific and reliable indication of time remaining. Maybe it's a patent thing, but my Sony prosumer camera from 2002 had a better indicator than pretty much anything not from Sony I've seen since.
There's a company that's been working on swappable car batteries for some time now:

http://www.betterplace.com/

I agree with you that this is the only realistic mainstream future of electric vehicles as long as batteries remain in their current low-density state.
Usually I prefer not to speculate on this sort of thing, because if we just wait we'll have a ton more information soon. However, I wonder if it could be a fulgerite: http://en.wikipedia.org/wiki/Fulgurite
Random question:

Demo day for summer YC is towards the end of August.

I've heard anecdotally that many investors travel during August, and that it is a poor time to fundraise.

But I've also heard that many investors come to Demo Day.

Is the anecdotal information that I heard incorrect?
He may have flipped principal and principle...
When I said, I didn't know how I was referring to the fact that I never expected that.

I started turn.js as a weekend hack with html5. Then, I showed it on HN and asked for a Job. Later, I went to some tech company, I didn't get forward for whatever reasons. Turn.js was initially MIT licensed, and I had literally no money. However, some people were making 30k or more selling my javascript on some marketplaces, so I decided to stop and get back my credits. I created a commercial license, and everything started to change. I never enjoyed my money, I came to the U.S. because I needed a degree...