skysight-inc/HackerNews huggingface dataset:
I built a paper and drinking straw canard glider in the 7th grade for a class project. I took Flight Dynamics and Control in college, while obtaining my degree in aerospace engineering. Your misapplied intuition about arrows is not at all convincing. Simply, you do not know anything about the stability of aircraft.

EDIT: WalterBright edited his comment to add examples and commentary after the arrow example. IOW, he added:

> Or make a paper airplane and toss it backwards.

> Or buy a toy glider and launch it backwards.

> They are unstable.

after I replied. His original comment was just:

> Try shooting an arrow with the feathers in the front :-)

A shitty move. I'll only address the "launch it backwards" comment, as the remaining bits are even more idiotic.

A canard airplane is not simply a backwards airplane. The criterion for stable forward motion, in pitch, is that dCm/d_alpha is negative, where Cm is the moment coefficient, and alpha is the angle of attack, and that the center of gravity be ahead of the center of lift. A "reversed" airplane, in either conventional or canard configuration, would have the center of gravity behind (in the new direction of travel) the center of lift, and would therefore be unstable.

Yaw stability is obtained by the vertical stabilizer exerting a moment opposite to the current yaw, by virtue of being behind the center of gravity and center of lift and, when yawed, being angled toward the midline of the aircraft. This is why, on a canard craft, the vertical stabilizer(s) are at the wing tips, or behind the center of lift and center of mass. A reversed aircraft, in WalterBright's imagination, or at his desk--It is difficult to trust anything he says, at this point.-- would have its vertical stabilizer ahead of the centers of lift and mass, and therefore destabilize the aircraft.

These two, that the center of mass is behind of the center of lift in the reversed configuration, and that the vertical stabilizer are ahead of it, are the actual reasons that WalterBright's toy glider, surprise, prefers to fly in the direction for which it was designed.

(He mentions the glider at his desk in his reply to this comment, which I will reproduce here, in case he deletes it: "I have a glider in my office. I launched it backwards. It promptly flipped over and proceeded in the normal direction.")

It would be interesting if, for example, WalterBright could produce a discussion from, say, Aerodynamics, Aeronautics, and Flight Mechanics, by Barnes W. McCormick, for example, warning the unawares aeronautical engineer in training of the dangers of the supposedly unstable canard aircraft.

The discussion above is all elementary flight mechanics, of which WalterBright would be aware if he'd had any training, or any expertise. Contrary to his repetition, his intuition does not suffice, and will not overturn these facts.
I don’t have a Facebook account, and on my phone I only see the initial post from Amazon.co.uk.
You might want to drop the R bit but actually the same org works across both the UKoGBnNI and the Republic of Ireland in a rare example of pragmatism.

The US Coast Guard has a rather different remit to the RNLI which is devoted purely to rescue. I believe the USCG has other duties as well. Contrast: https://www.uscg.mil/ and https://rnli.org/

The UK and Eire have a huge coastline relative to their land area and the RNLI are a treasured institution. Mostly staffed by volunteers and financed as a charity. We also have a Coast Guard which is actually responsible for search and rescue at sea. It's a little bit complicated but you will be pulled out of the water by a very highly trained civilian volunteer.

There is no reason not to start a non military ANLI. The RNLI already have boat designs that are proven and a operational model that is also proven. Just copy it.
I think most male teachers in the US will tell you that they have to be careful never to be alone in a room with a student, and careful never to hug a crying student.

Meanwhile female teachers either don't have to worry about this much, or will even be applauded for comforting a crying student by hugging them.
Agree, and maybe we should start installing more, smaller, less safe nuclear reactors (hence cheaper and more widespread), to the point where people are ok with the occasional failure and even with occasional loss of life resulting.

The vastly greater dangers of environmental collapse from global warning are so relatively long term that people can't make sensible risk analyses about them, hence the terror around nuclear and the nonchalance around reducing carbon emissions which are far more threatening.
fish doesn't try to support all of the weird historical quirks of Bourne-style shells, so its grammar and built-in 'API' are far simpler and clearer. Its out-of-the-box configuration is much much nicer for most people than zsh's. Completion definitions are easier to read/write. Its source code seems less byzantine. And its GitHub-based development model is more accessible.

The down side is that it's functionally very limited compared to zsh. fish's completion functions are easy to maintain, but the trade-off is that they don't offer the fine-grained contextual control over behaviour that zsh's do. Features like globbing, sub-shells, job control, co-processes, modules, &c., are absent or extremely limited. There are fewer knobs and switches, though as mentioned it tries to do the right thing for most people by default. And a consequence of the syntax being clearer is that it's also much more verbose, which i guess you may or may not appreciate.

Over-all i think fish is a good shell for the (very common) type of person who doesn't really care about shells but was drawn to zsh just because it has nicer completion than bash and lets you write fancy prompts. I don't think it's a good fit, yet, for people who write complex scripts or regularly make use of stuff like extended globs, background jobs, and fancy parameter expansions.
You mean no one's lining up to get low pay and frequent parental abuse? You don't say.
The amplifier converts the AC to DC anyway. Any marginally competent amp is going to include plenty of power filtering to reject noise. Surely with a $60,000 amp, it makes no difference whatsoever if your input waveform has some ripple.
Same here. I confirm your experience. Teaching takes a certain temperament though, and I admit I just don't have it.
It's not a new idea, really. I remember seeing Nagra come out with a battery-powered preamp for home stereos, many years ago (and I think they still make them).

I also remember hearing back in the day of some audiophiles powering their systems with regenerating UPS from APC (like the kind you'd see in a data center), though PS Audio has been making such units marketed for audiophiles for a while now too.
What kind of arguments you've been using? Are you talking specifically about the DA chips or the black boxes containing them? I pretty much can agree with you regarding the digital side of things, but could the actual appliances have notable differences in their analogue side or configuration? Maybe the actual value of having a $400 DAC appliance (built around a $2 Wolfson DAC chip) is going around problems in a computer's noisy or badly pre-amplified integrated audio output.

I don't mean to question your expertise on the subject, I'm just after an explanation what are the exact reasons why the setups with separate DAC and amp boxes have made me find new musical instruments on my audio files. And of course it would be nice to know if there is an inexpensive way of getting the analogue signal to a good amplifier without somehow ruining it.
You're describing here a different problem, which I know from talking to teachers also causes them stress. The people who make the software cause this problem, not the teachers themselves. They often don't have a way to avoid this and they aren't the ones deciding what software is used.
Agreed. I don’t get why induced demand is always presented as a bad thing. The title here is a perfect example. It “makes” people travel more, as if this is a bad thing people are being forced to do against their will. If we reframe it by saying it “allows” people to travel more then suddenly it becomes a good thing!

Of course we should carefully consider all the costs and externalities of road expansion before doing it. But it’s all too often presented as being completely pointless or having no redeeming features at all, so there’s no point in even considering it.
The only game, that I have played, that made me cry is the first Bioshock. Somehow I managed to not kill any of the girls (probably because I didn't catch the benefits) and the ending was so rewarding. I don't think I can achieve that anymore, I tried many times
They also allow illegal infringement on sellers. I knew a family that ran an Amazon import business and they bought an entire batch of surplus tennis shoes directly from a company in the primary supply chain of the shoe company. All on the up and up. The shoe company filed a complaint with Amazon that they were not authorized to sell their shoes and Amazon closed down the related listings. That was a serious restraint of trade and Amazon could likely be sued to the moon but they just moved on. I really wish they would have pursued the lawsuit against Amazon.
> I usually end up in a pretty good place but I'd be curious why this could not work?

It would be fantastically expensive. Chicago has 21,000 teachers. Paying them $1 million per year would cost $21 billion, dwarfing the city's current $3.8 billion budget. Even paying them $100,000 per year on average would cost half the city's budget.

And there is little reason to believe it would yield better results. American teachers are well paid compared to other OECD countries where students do better: https://www.businessinsider.com/teacher-salaries-by-country-....
I thought congress people make about $80,000 a year. That's a big chunk of change across most of the country.
I'm sure it's a bit of a circular problem. Fire dept has big trucks, so roads are built wide, so fire dept buys more big trucks, so more wide roads are built, etc. It's a hard cycle to break, even if everybody agrees it's the right thing to do.

But, yeah, the US really does suffer from a "bigger is better" complex. There are no small fire trucks for tight areas. Ambulances are all mega-sized, built on heavy commercial truck chassis. Personal vehicles are huge - SUVs and dually pickup trucks instead of sedans and hatchbacks.
From my experience for a lot of these 911 centers they are centered around counties(not all, but a lot). Back when they were first being set up with the internet capacity there were two issues. DSL was the only available service within the area, and the centers couldn’t afford large enough pipes. Talking early 2000s here. So a lot of these centers got pretty large grants from the feds.

They then hired one of the companies at the time that were doing these upgrades in bulk around the country when the money was flying because the fcc wanted all of the emergency services to move to narrow band from wide band.

These companies came in updated everything to modern and setup the contracts with the DSL providers back in the day(in my rural town I grew up in they just got 80mb cable internet in 2016, prior to that 10mb dsl was the best you could get there) In the west that was Qwest who became Century Link.

But government being what it is. A lot of these 911 centers have languished because there is no desire to invest in updating these systems as they are expensive and hve a difficult upgrade process. So a lot of these centers are just paying to bills and trying to scrape by with minimal funding. And so upgrades and redundancy aren’t even considered. Until something like this happens. And the feds might throw some money at the problem. All the centers will get grants to have failover and then will go back into dormancy of just working day to day with no budget.
1. Create a login mutation which creates a session and sends back a cookie.

2. Use resolver middleware to check whether the user is authenticated.

I like to use express-session (https://github.com/expressjs/session) for part 1 and graphql-middleware (https://github.com/prisma/graphql-middleware) for part 2.
I always assumed most people arriving at Elixir were Erlang neophytes, and as such, had never seen Ruby.

Maybe the ruby crowd is more pronounced in the elixir IRC inner circles?
Even if noise in the power signal were to influence audio quality to an appreciable amount, this way of solving the problem is rather curious for the uncompromising audiophiles.

Why would you install your own secondary transformer when you could just rectify the current, accumulate it and then use an inverter for a fraction of the price? Or even better just store the current and use it to power the audio equipment with direct current, skipping AC entirely.
Firefighters already have platinum-plated benefits 95% of people in tech can only fantasize about. Unless you are in the top tier of tech, your lifetime earnings will be much lower than a firefighter who has a pension. As a result, firefighting positions are already very difficult to obtain.

In any case, they are paid with taxes so you will have to explain to everyone in the private sector why they should become impoverished to pay people who already receive benefits unavailable in the private sector.

HN also seems to forget that teachers get three months off per year, every year.
But people will move to the periphery and commute farther, or change where their job is.
I don’t think this is true that teaching is a fallback more than it is for any other career, and if anything, the ignorance of this post is an example of why we are in the state that we are in.

If you wanted to be a doctor, maybe you become a nurse because of some circumstance. That doesn’t mean you’re not valuable and shouldn’t be paid decently.

We don’t pay teachers just as we don’t properly find public education. At my high school in the Midwest, we invested more into football and basketball than the actual curriculum. Calculus and precalculis were not even offered.
The difference between hobby/research robot and similar industrial robot is the cost of maintenance and uptime.

If you run cheap robot continuously, it wears down quickly.
There was one.

https://en.m.wikipedia.org/wiki/United_States_Life-Saving_Se...
s/^/Show HN: / ?
Nuclear doesn’t perpetuate complete dependence, because it has never been intended to be the sole provider of energy to its customers. Even the most ardent nuclear cheerleaders pose it as a single component in an energy mix.
Operator precedence isn't really a new concept, and Python relies on it in plenty other situations:

bar = 1 + 1

I do believe Python made the right call, actually: print needed to be unified with functions, and dropping the requirement for parenthesis for function calls would have introduced so much incompatibility as to make the Python 2 -> 3 transition far more difficult.

But ignoring the legacy issue, there is a better way to do function calls, and it is ruby.
hmm, I guess that's not ideal.
Show HN: CodePen-Style React Apps in VS Code
Interesting, my family's hometown in the UK (Blairgowrie, Scotland) is full of those types of streets. And with street-side parking, the open lane can vary. It doesn't seem to be a problem - people are used to it. Granted, small farming town vs big city, but still, there's no fundamental reason people should suddenly turn into arseholes just because the streets are narrow.
Piling on the nitpicking.

Portugal isn't 'on the way' to New Zealand from Tokyo regardless of speed or timelines.
Is the pipe idiomatic c++ or is this an operator overload that requires readers to go learn a new piece of syntax?
Yes, which is why this is one of the more absurd pieces of audiophile gear.
Babel + a million lines of Javascript, and a few other build steps. Durying development, only the required modules are built, so it takes only a few minutes to get up and running, but a full build takes ~1 hour and produces ~100mb in bundles.
You know you run tcsh. fish users usually know they run fish. You don't expect to be able to run arbitrary copy-pasted shell snippets in the first place.
This article is one of the most stupid things I've ever read, pretending there is some crisis of students seducing their poor, persecuted male teachers because of a reddit thread is not merely intellectually dishonest, it's just bizarre.
The user inputs ? but the shell inserts \?. The shell would be guessing that the user meant to input something different than what was actually input.
Well, sometimes you can't avoid it :-) But since you mentioned live reload, BuckleScript now also has instant live reload via a WebSocket connection to the browser: https://bucklescript.github.io/blog/2018/07/17/release-4-0-0...
The winter vs. summer amount can be far more, and then you have heating costs to provide power for.
Increased taxes are extremely unpopular. Gas taxes, which are supposed to fund road maintenance, are almost always a fixed per-gallon amount, so they gradually erode due to inflation. They also effectively shrink due to increasing fuel efficiency. Just keeping gas taxes actually steady looks like an increase, and voting for that is a good way for politicians to lose elections.
It does if you're coming into an existing project that was build that way.
That usage doesn't get the weirdly specific error message though. It's only the Python2-ish statement that gets one.
Developer Relations: (More Than) the Art of Talking Good
If we're exchanging anecdotes, I had male (and female) teachers in middle and high school (early to mid 2000s) who often spent time alone with students - including myself. Maybe things have changed.

I also would have felt weird being hugged or otherwise touched by any teacher, male or female. I don't remember seeing much of that.
> I haven’t seen this model used anywhere, but I could imagine a video game where you buy the right to do one irreversible play through of a story mode, cloud saved on their systems so you can’t manage the data yourself.

Ooh. I'd love to see a Fire Emblem style game like this. No main character, so any of them can die and not end the story. If a main character dies, someone else can take up their path, or it can slightly diverge. Ending depends on who's left alive at the end. It'd be a mess to do I think, especially dealing with when characters die and adjusting the storyline, but it'd be super interesting and you could easily get multiple playthroughs. I'd even say that the game allows you to do multiple ones, with each death/recruit being an autosave, so you can't undo it.
2018 in Review: Bitcoin Protocol Improvements and Proposals
I figure the best way to understand it is as an incremental set of small choices that each seemed like a good idea at the time. Fundamentally people like traveling in cars, and hate traffic. These two things pretty easily make the case as the underlying principals of everything driving car-centered city design today- parking minimums, wider & wider roads, cannibalizing trolley track, marginalization of pedestrian & bicyclists, etc. Then you begin to get second order effects- because everyone drives, things like storefront design codes are just inherently designed for the gaze of the automobile driver. (That one was an eye-opener for some of the subtle effects of car-centric worldview)
Right. It(audiophiles) also seems like a pretty dead horse to beat. Not many original criticisms come of these discussions.

Ya don't have people critizing folks buying a Porsche when a corolla will do the job just as well.

Audiophiles, as well as "hipsters" I think just provide themselves as an easy target for internet commentators.
FYI: I just put the PDF on my Kindle Paperwhite and it actually looks like a regular ebook in terms of font size and readability so far.
It’s more work, and that’s exactly the problem. A teacher deserves to go home and enjoy their family and life outside of work. The only way to make this possible is to have students and parents understand that after a certain point the grade is simply final, so if you want a good grade it’s your responsibility to learn the material prior to exams or large projects or assignments being due. Everyone knows this; there is no secret. So I don’t think it’s fair at all to expect the teacher to do more work for you when you didn’t put in the effort to learn the material the first time.
> I can't imagine what it must feel like to be a student now and being told school is closed because my teachers are protesting.

Students should feel proud that their teachers care enough to stick around and fix things instead of quitting and finding another job. I know several people who have left the teaching profession in the face of poor pay and lack of autonomy and respect, or moved out of states where teacher pay is poor.
If we accept that the characteristics that grades are meant to represent are dynamic, what is the benefit of recording them at all? They will be perpetually out of date as people continue to learn (and forget).
Well people keep picking arbitrary starting points in the coordinate system. I'm saying for any arbitrarily picked starting point in the coordinate system, the time taken is always twice that of getting from the arbitrarily picked starting point to the halfway mark.

A tautology is a tautology.

How long is a piece of string?
> I've taught at a college level, and I always give students the chance to improve their grades if they want to put in additional work.

Isn't it 'rigid' to give only a limited amount of time( end of yr or whatever) for that chance. Seems like saying "nope, even if you learn more and improve to the point of A-level knowledge, you're still getting a lower grade".
This. The number of errors my son's teachers commit is appalling, and he's in a top 50 hs in the country.
>Same number of misses, but each miss is effectively half as costly

Wow, I'm still trying to wrap my head around that.

I was going to argue that in cases where there's no way to split an algorithm across multiple threads without extremely frequent IPC, pipelining can probably get better performance than multiple cores, but then I realized that I have absolutely nothing to base that claim on.

I still wouldn't opt for more cores rather than higher clock speed without first trying to benchmark my expected workloads, but you have given me some very interesting things to think about.
>What about the electric grid? Water and sewer? Schools, parking, trash pickup, etc.

Property taxes can pay for these updates once the additional housing is built, it's self-financing. (Of course this won't work in CA, due to Prop 13. But then again, it was a ballot initiative, and those crazy folks in California voted for it. It's all self-inflicted pain on their part.)
Age of Empires II is the best PC video game of all time
Screw the car. I want my receipts downloadable!
What if I spend 40 hours a week making paper hats? Should I be entitled to a living wage?
Sun had the hardware that Larry wanted for his engineered systems. Prior to that there was an announced partnership with HP for that.

The Google lawsuit came later. Remember the purchase was in 2009, when Android was still in its early days in terms of adoption and market share.
Lots of comments to the tune of "pay teachers more." Teachers in large urban areas with strong unions tend to be paid quite well, especially factoring in benefits, and it doesn't necessarily correlate that well with various metrics of "success" in education (standardized test scores, on-time graduation rate, fewer violent incidents) once you look into individual cases and see through the administrative means by which those numbers can be rigged. Of course, there are markets where teachers make very little, with many needing to take second jobs, and I don't mean higher salary wouldn't help in those districts. I think the comments that speak to the respect for the profession, unreasonable accountability, and increasingly risky liability are more on the mark about why people jump ship when their career prospects improve in a strong economy.