skysight-inc/HackerNews huggingface dataset:
Ok, we've changed the url from https://www.theatlantic.com/science/archive/2017/01/what-hap... to the one it points to.
It’s not perpetual motion because it’s extracting energy from the fact that the wind is moving relative to the ground. Without wind moving relative to the ground it wouldn’t work.
Interesting! Setting the weight of the compressors and the energy requirements (I guess you could supply that ground side if possible) it really does solve the issue of loosing helium. :)

For hydrogen you I guess you could either let it go or also use the compressors in case there is no way to replenish the lifting gas & you might need the extra lift before returning to your primary maintenance base.
I’m not sure what “novice” means. I certainly know when I was beginning I glossed over stack traces because they were a giant information dump and I didn’t know how to read them. They tell you exactly what’s happened, the call, what line it broke, what the local variables are, how it got there, etc. But it’s like reading a foreign language and is intimidating for a beginner.

IDEs help a lot but once you know how to read a stack trace it’s easy to understand if you made a typo:

AttributeError: Person object type has no attribute “helo”

…or have a bug:

AttributeError: None type has no attribute “hello”
That's just a pedantic word discussion in my option, "political" can mean so many different things. This is clearly political in a way, yet the hacker group can also not be supporting any other politician directly.
> not how natural selection works

> mutant spawn survived

>leads to different future adaptations
GPT-J API and Playground Freely Accessible
State-of-the-art language model is freely accessible via API
Awesome article, I'd turn into a human from WALL-E after a few months of it. How do you avoid water outside? Between neighborhood kids playing with squirt guns in the pool next door and the sweat from outdoor temperatures it seems hazardous. Another problem I had was screen brightness, the sun always found a way to make the screen unreadable or get in my eyes.
A lot of wisdom to unpack here. Thank you for sharing!
I don't expect to get an explanation for why this received downvotes - but maybe someone can offer one?

My best theory is that it's the Reddit "I don't need to understand how stuff works to be a programmer" crowd.
> Having looked into carnivorous plants for a while, I am so glad they never grew significantly bigger...

Considering that we believe prehistoric times were incredibly lush with vegetation you may be right. The plants of your nightmares are likely to thrive in the future though when we have depleted the nutrients from our soil. As someone else mentioned, nature finds a way. It’s easy to forget that being at the top of the food chain puts us at the mercy of everything beneath… and when it comes time for Mother Nature to choose, she will likely begin culling from the top.
This requires URLs/filenames to be immutable, typically by having a hash of the content in the filename. Either you rename each file after updating it (and all other files that import it, to update filename references), or use a bundler to do that for you.
Not sure about Android but iOS will automatically clear caches only if your free storage gets low. So if you have a lot of storage space, those numbers are probably expected.
The space between despair and hope is filled with options. It is easier to think of extremes and binaries theoretically and this limits action.

Seeing things as landscapes, gradients, allows for choosing where to be on the spectrum.

So climate change is happening? What will you do?
Great idea. I want to build a house out of CCS bricks!

I don't (yet) understand the chemistry behind extracting solid carbon from the air for cheap, but I have reason to believe it's possible: https://www.nature.com/articles/s41467-019-08824-8

Another aspect of this is that it could maybe exploit modern monetary policy. Price of bricks getting too high? Maybe 'ease' a few more into circulation by buying them with new dollars.
Cuneiform Clock (2008) [video]
Thanks! Can you translate part 2 and 3 too? There was some talk about the election in there I think.
Ask HN: Share comics about software development?
I'm curious to know if there exist quality comics about software development. Maybe you could structure your post like this :
- Title.
- What is it about specifically. (Synopsis)
- Url to where you can buy/read the comic.
- Your personal opinion on it and why do you recommend it.
Lisp is polish notation for trees of variable arity. hence all the parens - you need some way to group them.

So in some K flavoured LISP I think it would be

((/ +) (! 100))
I think they still have a point though:

Let X be any linear measurement of the airship (like length). The forces on the airship are proportional to X^2, and the max mass is proportional to X^3. Consequently, acceleration from wind and whatnot tends to 0 as the airship size increases (when fully loaded).

Moreover, the necessary propulsion similarly scales with X^2 (which is convenient, because that's the amount of space you have to place the propulsion), while requiring increasingly negligible fractions of the ship's carrying capacity as the ship size increases.
Because that's what their analysis was about.
There is no theoretical limit on the speed of the vehicle though - just a practical one based on limits to propeller efficiency and the fact that drag for the craft keeps going up.
Sorry for accidentally implying that you didn't agree, I was just kind of hoping you might have an answer!
I'm sure it's taught differently in different places, but what I want to see is: the science fair projects that everyone does should consist mostly of data-gathering _before_ the hypothesis step. Instead of mostly being about verifying a hypothesis, it should mostly be about _constructing_ an interesting hypothesis (and then verifying it afterwards).
Funny how your purchase is fueling their squatting.
To be fair, if people living in cities tend to have much lower GHG emissions than people living in rural areas, we probably want to have an extra incentive for people to live in cities, right? And even with that, there is a pretty wide variation of emissions levels between consumers in each of these types of regions.

You can have a very small town of 100 people that is designed so people can get around without a car. Small towns in Ireland, for example, look very different from small towns in the US -- but we used to build like that, and we can again. If you live out in the sticks, you probably make a lot of unnecessary trips because fuel is cheap, where there is potential to wait and do lots of shopping at once. You can probably insulate your house better, buy an electric water heater, stick solar panels on your house, etc.

Farms depend on a lot of machinery that uses fossil fuels right now, which is difficult to change, but could gradually be converted to more efficient energy sources. And actually, the Energy Innovation Act, which is Citizens' Climate Lobby's preferred carbon tax, has an exemption for agriculture -- it's a very small part of emissions, and it's worth it to get more people on board with the bill and get it passed sooner rather than later.

And we shouldn't compare an imperfect but still good tax to some unachievable ideal, we should compare it to other real-world solutions, and in that comparison, I think a carbon tax with dividend is probably the fairest and most cost-effective way to quickly cut carbon emissions.
You are 100% correct.

The boogeyman of confirmation bias paralyzes researchers.
Brilliant.

“A website that lets you easily buy the best local daycares.”
>Prices on almost all food, all clothes...

But can we even compare food and clothes from 1920s to today? Of course prices have gone down, and the quality has diminished greatly along with the prices. None of our food is nearly as nutrient dense as it was in the 1920s. Large yields is what the large producers care about. What does this mean for most foods mass produced these days? More water added. You're paying less, because you're getting significantly less.
I was going off my memory of Bison populations, was way off there, thanks for the correction.

Either way, we'd still be better off if we dramatically reduced cattle farming and restored some or all of that habitat, particularly in South America.
> NOTE: this is a USA-centric viewpoint

Those are USA-centric examples.

I'm sure the viewpoint is just as valid across five eyes and even worse in places like Saudi Arabia, Turkey, China et al.

I'm from Australia, allegedly a 1st world democracy - and secret wiretaps, secret evidence (and even secret trials!), overseas torture facilities, imprisonment without charges - are all public policy, covered my the media, and enshrined in laws passes by both of the two-party political system.
The Smith-Mundt Modernization Act of 2012 (2019)
Yes. It's not a coincidence that John Bolton, David Hale, and Pompeo each visited Belarus separately in the year before COVID-19. And then during the protests last year, Pompeo made all these statements about how they will deliver "freedom" to Belarus.
I’ve now experienced people committing suicide over getting caught embezzling far fewer zeros.

It’s interesting how people respond differently to messing with peoples money.
Why doesn't nom adopt the symlinking that pnpm does? Always asked myself that, as it doesn't seem to have any downsides to me.
Update Old Content (Part3)
Five. Make your site more fresh
Fresh sites rank higher.
Sites that post new content frequently will be given a higher ranking by Google.
Ultimately, abandoned sites that are no longer updated do not rank well, even if the articles are of great value.
A site that isn't updated recently will hurt the rankings of all its pages if Google notices it.
By revitalizing this old content, you can dramatically increase your traffic. Your entire site can be validated through a few updates on key articles.

Google will boost your ranking for every new piece of content on your website, since Google recognizes fresh content.
Even if an article isn't correct, Google will interpret it as giving the entire site a higher value, so if you publish a lot, your rankings will improve.

Sixth. Remove broken links to add value
A common problem with old content is broken links.
It is often the case that the helpful resources you linked to in the original article are no longer available. There may be a problem with the website or it might have changed URLs.
In both cases, you suffer a drop in Google rankings, as well as a drop in search engine results.
You don't have to worry about fixing your broken links.
Here are two free tools you can use to achieve this. Broken Link Checker is an online tool.
Fill out the URL for your domain there. You can then click "Find broken links."

Click "Find broken links" and enter the security code when prompted.Click the "" button.

Any links found will be notified to you after a couple of minutes. Those need to be repaired.

Broken Link Checker for Google Chrome is the second tool I recommend. You can install it on your Chrome browser for free.
On the plugin page, click "+ Add to Chrome" to download it into Chrome.

Choose "Add extension" when prompted by Chrome.

Your browser's header bar will feature a small icon created by this procedure.

To use the tool, just navigate to the post you’d like to check and click on the icon. It will display a small box on top of the page.
By using this tool, you will be able to locate broken links. Various types of links will be shown, including those that are working and those that aren't.

The green highlights indicate that the links are working correctly. A pink indicator will appear on each link that is missing or that leads to a 404 page.

In order to repair a broken link, you need to find the original page you linked to and see how it may be published in other ways. Improving things in this way is the easiest thing you can do.
Taking more drastic measures is necessary if the article is truly offline. Look for another quality resource to link to instead of the other resource.
For those who cannot find the link and don't find anything similar, you may wish to just delete it. An inactive link is preferable to a dead one.
Your page will be considered more valuable to Google if you fix or remove broken links.

My goal is to help provide the best information I can. I do not participate in spam an always look to improve. If this was any help please feel free to join our newsletter for all up to date content.
Join here
> including revealing the apartments and cars they use when on the job.

If the population is fed up enough to be willing to resort to violence, simply releasing this list with no prior warning would likely cripple the security apparatus, and make everyone think twice about participating in it in the future.
Thanks for pointing this out - seems like another step by corporates towards stepping up control over open source software. I'd rather have someone like the Free Software Foundation and EFF to be in charge of these kinds of things.
> The typing exercises remind me of 80s/90s computer magazines

YUP! I've been collecting the old Usbourne and Micro Adventure books and typically bring them along when I give presentations to say "This is how they did it in the old days! Let's do it again!" I then compare it to other "technical" skills like playing an instrument, acting, and martial arts. Each one has a "you gotta memorize/drill this" phase that is imperative to higher level performance, creativity, or problem solving.

> The natural next thing to do is to try to change some values and see what happens.

There is some work out of the UK known as PRIMM that uses this as one of their initial steps [1]. I spoke with Sue Sentance at SIGCSE in 2017 when she presented her studies and it sounds like another cool way to present coding practice without problem solving. John Edwards out of Utah is also doing "simple syntax exercises" [2] for his style of drilling where you have students do 20-30 exercises on a concept without very minor changes like "make the loop go 3 times; now 4; now go backwards from 4 to 0; etc.".

[1] https://blogs.kcl.ac.uk/cser/2017/09/01/primm-a-structured-a...

[2] https://dl.acm.org/doi/pdf/10.1145/3372782.3406259
Yeah. Wind pushes the propeller (and attached vehicle) forward, and as the vehicle starts traveling forward, the wheels turn the propeller generating extra thrust (at the expense of the wheels pushing backwards by a smaller amount against the ground), allowing the vehicle to continue to accelerate past the wind speed.
npm is one of the only dependency managers I’ve seen that does more than install packages. Every other package manager: pip, bundler, composer, all do one thing and do it well. npm does everything but nothing well.
They have 4 steps if I recall clearly.
The more time passes, the more people support a carbon tax. A carbon tax and dividend is actually supported by a majority of Americans of both parties, now. But Congress is lagging behind popular support a bit, and needs people to let them know that we do support it.
Apple could have solved the issue by making iCloud photo sharing its own separate App.

The App could have done the scanning before sending and I would be free to not install it on my phone if I don't use iCloud photo sharing.

Instead, we now have an ever-present spyware engine embedded into the OS itself that can be abused by policy, as the author points out.

But I guess having a separate App would potentially cut into Apple's bottom line as it would have lessen the opportunities of pushing for iCloud subscriptions.
No, I'm saying stop being a nerd. I do understand the technology just fine -- but that's entirely beside the point. A deep understanding of the technology is not necessary. A shallow understanding is sufficient.

Let's go back to a real case, Kyllo v. US. They used a thermal imaging camera to "look inside" a building, from the unusual heat signature, they correctly presumed a marijuana grow operation, and went in without a warrant.

Doesn't matter though. The court said they needed a warrant because people should be able to presume a level of privacy that the camera violated. Anything that one reasonably believes is private should be protected like that, regardless of whether you are using technology to "look" at it or not. The authorities observed a thing that a reasonable person would think of as private because they treated it that way.

Same applies here, even moreso, because Apple has previously guaranteed privacy, and already- this is not privacy on its face.

The only really important gap in knowledge is the one I mentioned before, that this does also end up in a slippery slope.
In the U.S, it is ok to completely disinherit children. It has to be done so explicitly though.
Charlie Bell Leaving AWS
Huh, I had no idea that function had variable arity. Thanks.
Don't Be Fooled by the Bipartisan, 'Paid for' Infrastructure Bill
how is "%%@~" different from, say, "°"? Since they're both designed to be contentless, couldn't you form a bijection between them without losing anything? (And if your objection is atomicity, how do you feel about "%" and "°"?)
The Epson FastFoto series is really good and comes with OCR software (but the install procedure can be a pain). (They basically modified their duplex workforce series). The latest (680?) Is also wifi ready. Ignore the misleading "direct to Dropbox/cloud" marketing as it still needs a host computer middle man.

It's super fast for documents and the bonus is that it's great for photos (600dpi dual sided feed scanner).

Epson has a super portable (battery too) workforce that folds up small (Es-300 I think.)
Wifi capable but the connection process is a bit cumbersome.

I run a photo/document scanning service between Toronto/Montreal and am currently getting rid of some duplex high speed scanners for cheap if by chance local.
Acoustics relies on an analogy to electronic circuit components.
Leaving iOS. Buying a Fairphone and crying about the lack of anything like Apple Watch.
The NIMBYs would never allow a hydrogen fuelled airship anywhere near anywhere.
I assume performance is a lot less predictable with that method, no?
Dr. Scott Gottlieb says the Covid delta surge may be the ‘final wave’ in U.S.
Thank you. Third-party doctrine was what I was thinking of. So I'm guessing putting things in your phone will soon be seen as crossing into third-part territory if it hasn't already.
A really nice paper planner that works for the way I think.

For years I was around developers a lot and so they tend to push the mentality that the best tool for organization must be digital. So I tried Trello, google calendar, various habit tracking apps, etc. None of them really had everything I wanted...

Finally I am happy with a paper planner, sticky notes, wet-erase markers that make the laminate cover into a go-anywhere brainstorming tool, pretty pen colors and even stickers as a rewards for hard tasks.

You can get a "masculine" planner like they have at Levenger or Golden Coil, or a more "feminine" planner from Erin Condren, Emily Ley, Plum Paper, Limelife or Northfolk.
It’s pretty bad news for the creatures and plants in that ecosystem. Maybe in evolutionary terms it’s not a big deal, but it will mean the wiping out many populations and even species.

At a personal level, the extinction of the giant sequoias or the spotted owls doesn’t seem like a very desirable outcome.
Hi - I am in the process of switching career into tech after years in finance and consulting. Interested in your DS/ML roles if any. My email is kn2465 at columbia edu
>Furthermore, children are re-victimized every time a file is shared, sustaining the abuse in a continuous loop.

I've seen this argument many times, and I agree that initial act is horrendous of course, but I believe this is overstating the ongoing damage.
Ugh same. Very common that I get slightly irritated by folks who blindly wrap something with no real reason other than "somebody else wrapped something similar so I'll wrap this for consistancy". Too many juniors thinking that they need more files/PR due to impostor syndrome...
I have gone on a of number cruises, especially on the Alaskan cruise and Panama cruise the one thing I never heard from anyone was "I wish they traveled faster.".

There is a number of trips that a slow and quiet trip would make for great fun.
I think this is a bit much. Pip takes almost no time to set up and use. It ships with MacOS in fact.
It should be noted that, according to Wikipedia, the K language isn't a toy language like Brainfuck but an actual language successfully used for a suite of financial software. It was developed for this purpose, not for code golf.
> Theoretically, a government could issue a warrant for every single person’s phone and get what they want.

For that you'd need a sham court full of rubber stamping judges handing out bogus search warrants for every single questionable and illegal request that comes to them. That seems a stretch of the imagination? What judge would to _that?_

We could call that the FISA Court, right?
How sleep
Ask HN: What are low level visualization libraries other than D3.js?
I’m interested in making highly customized visualizations that are highly dense in data. Is D3.js still the defacto low level visualization library? Is JavaScript the only option? Are there any low level alternatives in either scripting languages like python and R, or in compiled languages like C++ or Rust?
Ask HN: What is the best technical book you've read in 2021?
> 16.1 km/s to get to Mercury

That's if you want to slingshot yourself to Mercury with no fuel though, right?

If you have fuel then you can keep going to Mercury at a steady 0.1 km/s by constantly firing rockets to maintain that speed, and get there eventually.

You don't need escape velocity to leave the Earth either; you only need escape velocity if you want to maintain orbit without constantly firing rockets.
No cofounders is a known problem when it comes to YC applications.

Finding a cofounder is not going to be among the hardest problems either will face.

It is not unreasonable to expect significantly greater resourcefulness from a fifty-five year old than a twenty year old when it comes to any particular problem.
You sail at night. It's not rocket science.
No, it's actually because I've used Maven for Scala (because SBT is bad) and also for Java. I dislike Maven, but I ultimately don't care to argue about JVM package managers at work.
How is the symbolic transformation approach different between Modia and ModelingToolkit for ODEs ? I would guess Modia probably uses the same method as Dymola but not sure if MTK has any specific advantages here.

As of now, Modias DSL feels more familiar and less boilerplate-y to me (as a modelica dev) but I guess that's probably because they just focus on similar capability to Modelica unlike MTK which has a lot of expandability.

With that being said, having a decent component library (like MSL) and a GUI (or preferably some auto diagram) to compose and browse through them would be the minimum needed to be able to beat Modelica in the acausal modeling space.
It doesn’t. If you pulled ‘down’, it would just make the orbit eccentric.
I think its a two-fold issue:

1) Version control adds ANOTHER concept to students that can be difficult to grasp/appreciate. Adding it in is great from a practicality standpoint but increases the cognitive load of students with ANOTHER new technology.

2) Sometimes, the code just hits a point where its no longer salvageable. It sucks to tell a student they should start over, but often times wiping the slate clean after making a mess can help consolidate their thought process.
To me the most immediately meaningful revelation is that non-prescription CBD preparations generally have practically no CBD in them. And, nobody is saying what they have instead. But, do you actually need a prescription to buy the real stuff being prescribed?