skysight-inc/HackerNews huggingface dataset:
Study: Acoustic Virtual Vortices with Tunable Orbital Angular Momentum for Trapping of Mie Particles

Citation: Asier Marzo, Mihai Caleap, Bruce W. Drinkwater. Phys. Rev. Lett. 120, 044301 – Published 22 January 2018.

Link: https://doi.org/10.1103/PhysRevLett.120.044301

DOI: 10.1103/PhysRevLett.120.044301

Abstract: Acoustic vortices can transfer angular momentum and trap particles. Here, we show that particles trapped in airborne acoustic vortices orbit at high speeds, leading to dynamic instability and ejection. We demonstrate stable trapping inside acoustic vortices by generating sequences of short-pulsed vortices of equal helicity but opposite chirality. This produces a “virtual vortex” with an orbital angular momentum that can be tuned independently of the trapping force. We use this method to adjust the rotational speed of particles inside a vortex beam and, for the first time, create three-dimensional acoustics traps for particles of wavelength order (i.e., Mie particles).
Thanks. It is indeed not very intuitive.
I think if either a project that FB uses upstream has Apache 2 or if you are a large organization (for example the Apache Software Foundation) you can use your clout to force Facebook to use Apache.
This seems to be react only? That bit of information is buried. Seems like a good opportunity to release a web component library for the whole web dev ecosystem.
Heck its not all about low paid jobs. That's just another domino. Folks who used to be office managers, technical writers, factory line managers find themselves automated out of a job. They turn to lower-paid jobs.

To compound it all, now the lower-paid jobs are going too. Leaving a 'bow wave' of steadily-lower-wage folks completely out of options.
Steps to Consider When Validating Your Product Idea
I can assure you that the project is alive. Danny Hillis gave a quick status update to Long Now Boston group last summer.
Write it on a post-it note and put it in your wallet. If you lose your wallet you probably have some work to do anyway to cancel cards. Just change your password first.
GitLab Ultimate does not restrict the number of targets you can test.

What are the funky problems you encountered?
So many things are already written in Perl, so moving to another language just for popularity’s sake unnecessarily introduces another standard in an environment. There might be reasons a new language is needed, but sticking to Perl and Bash, if that’s mostly what your environment has, makes sense in many cases.

The popularity argument only makes sense in regards to hiring new people, which is a fair point.
Tesla CEO Elon Musk's new pay package is a publicity stunt that's also real
Yeah, exactly what you said.

I work on software for public transit agencies, and Dynamicland immediately made me think of a workshop that Jarrett Walker (humantransit.org) sometimes runs, which involves physical paper and pieces of coloured strings. So I tried to build something inspired by that (https://twitter.com/JanPaul123/status/923037721760735232).

But that experiment didn't involve having programs interact which each other, which is way more powerful as then anyone looking at the table can rearrange the programs differently, which itself becomes a form of programming (when your programs do small enough things).

So anyway, no specific use case yet, I think it's too early for that.
I feel it's more.

We have so many short term ideas: chasing quarterly profits, carrying a national debt, passing climate decline to our kids, designing garbage appliances and vehicles that fail right after warranty, and on and on.

This is showing us where the other side of the road is with long term thinking. How do you keep an institution running--physically and socially--for 10 ky? How do you even communicate with people 10 ky from now? We can't even read half the stuff written in stone 2 ky ago about big things like kings and wars; forget about writing a detailed maintenance manual, or describing tools or materials they'll need in a language probably dead for thousands of years. Will they even want to?

So by having examples of both kinds of organizations, the middle of the road is more moderate, moved away from disposable, self serving, instant gratification and more towards sustainable and altrustic.
Convenient redirection? If you do a search on DDG and don't get a viable result, move to the beginning of the search field and add !g and try again.

Depending on their logging, this may also allow DDG to see what kinds of searches are being done and then redone/redirected to Google. In aggregate, that may provide useful information on areas where their search results aren't good enough.
> to pull a "Volkswagen"

Very specific model - The Bug
Makes a lot of sense for angel investors that want to get better access and have visibility into these types of deals.
AFAIK it's the handling of <noscript> blocks in the HTML: if JS is on in the browser, the browser skips the block and extensions can't easily activate it after-the-fact.
One-time, one-way mirroring has. Continuous push-for-push mirroring is still an EE feature.
CSCI E-191 Classics of Computer Science (harvard.edu)
How Cognitive Biases Affect Entrepreneurs
While I like Petersen's message and analytical competence quite a bit, in this interview he makes the mistake that a lot of highly intelligent people make: he states the truth at his level of intelligence and training and expects the other person to understand perfectly. "If you've correctly listened to my exact construction of words, you should understand." He could do better at connecting with her, on a relational level and not only an intellectual one. (Which, yes, is much more of an abstract concept and is typically a lot harder for intellectual people, and is definitely a lot harder when someone seems hostile.)

He still does a good job of articulating the nuances of his position, but needs perhaps a little more connective tissue to let her know "I'm not against women! Hear me out." And I don't mean to let her off the hook, because she inappropriately framed his arguments a number of times.

It's incredibly difficult to think on your feet in front of an audience/camera, let alone actually learn and genuinely absorb an entirely new level of complexity for something you already think you know. I appreciate what Petersen's saying about how the gender gap as described is a myth, and he articulates his reason for saying so: it's actually an 18-factor gap. But after he explains this and she continues to use the phrase gender gap multiple times to challenge his view, that's where he needed to identify that she has not correctly processed his real view, and stop her: "But ok it shouldn't be called a gender gap: based on the data, it's an 18-factor gap. Do you see what I'm saying?"

Connective tissue; reading your audience.
Same. It's been great. Their spam filter needed a little tweaking from the default settings, but other than that, I've had no problems with the service.
Why don't they dynamite it so that it collapses while everyone's extremely prepared, instead of being semi prepared for months or longer?
A little history here is perhaps useful.

A number of years back, the Long Now moved their offices to the current space at Fort Mason. Part of the reason they picked the spot was that the ground floor could be a small museum, showcasing the Long Now's work the public, including the many tourists passing by.

However, although many passed by, not many actually came in. After some years, they decided to give people another reason to come in, one that has worked for centuries: caffeine and alcohol. So, via their "brickstarter" campaign, [1] they raised money to redo the historic space. (FYI, I'm a donor.)

It worked out wonderfully. I was in there the other night and every chair was full. And not just of random drinkers, but many people clearly interested in what was going on. Around the orrery [2] was a group of people animatedly discussing its purpose. People were looking at the exhibits. In front of one of the patrons at the bar was a fat Roger Penrose book.

And I should add that this wasn't a "pivot". All of the Long Now's projects still go on as before. And having their own venue has allowed them to expand their lecture series from once a month to almost weekly.

I was skeptical when the idea initially came up, but as a donor, occasional volunteer, and long-time fan, I think it has worked out wonderfully. Their mission, after all, is to get people to think about he long term, and the first step of that is getting their attention. Thousands of people per year now visit that wouldn't have. To me that's a win.

[1] http://blog.longnow.org/02014/09/22/the-interval-brickstarte...

[2] http://longnow.org/clock/orrery/
I'm a huge fan of styled components for React/Redux projects. It really makes styling components easier while also promoting reusable code. Being able to pass props to your styled components is a huge win too.
Bolt: An End-To-End Payments Stack with Zero Fraud
When textiles automated in England, the carnage included a generation of weavers starving to death.

Consumerism and technology have coincidentally grown to provide a few more generations of employment. But now that's ending.

And sure its not happened in history, because we've never been exactly here before. But we're here now! And there's no sign that solutions will fall out of the sky to fix things. I for one don't want to wait for starvation or revolution.
Exports of what? iPhones? These are all made in China, and with the dollar dropping against the Yuan, anything the US imports from China (and also from Europe) will be getting more expensive. And with the dollar dropping, bonds in dollars will be less interesting for investors.
Basically, the article suggests that where Trump is aiming to MAGA, the entire opposite seems to happen: the rest of the world accellerates where Trump hits the breaks. Take the example of solar panels: what good will this do to the US? It will make solar-companies doing less research as the Chinese competition is gone. It will impact consumers, and the environment. But it will hardly impact the Chinese - their export will be used internally and in Europe.

Edit: yeah - the Europeans make cars... Volkswagen is the second largest in the world, after Toyota. Daimler (Mercedes) is fourth. Apparently, the top-16 based on revenue includes only 3 American companies...
Just to add to the other comments already addressing the !g option: I use DuckDuckGo exclusively but I almost never use it's actual search results as a Google replacement for precisely this reason. It's just that I use !w, !imdb, !m, !n, !ups & friends so often, than it's worth it to just prefix my search with !g when I do want traditional web search. But now I've stopped using Google as a shortcut to get to what I already know I'm looking for but don't want to type the full address. I really just use DuckDuckGo results when I do want the privacy especially.
The interesting thing is, this article sounds scary ... "ooooh, e.coli, fear, tremble, shake". But while people could get sick from drinking airplane coffee/tea, I question if there's any evidence that this is actually happening. That is, where's the long line of people who actually got sick as a result of drinking a cup of coffee or tea on an airplane.

Anecdotally (and we all know what that's worth) when I was a consultant I flew around all the time and I always drank coffee on planes and I never got sick. And I can't recall a single case of a colleague getting sick in any way that would have any apparent connection to this "problem".

Hey, maybe it's a real thing, and I was just very lucky. But color me skeptical with regards to the idea that drinking airplane coffee/tea is actually any particular threat.
> just a nasty scheme we put up with since we know not better way of not killing each other or exterminating ourselves as a species

Sometimes I "have to do stuff to keep my wife happy." Once I discovered that I'm doing it because I want both her and myself to be happy, and stopped viewing it as an obligation, my life significantly improved. I learned to enjoy the ride. I think it made life a little better for the people around me, too. I learned that being petulant/sulky/edgy was not a sign of sophistication or wisdom.

Similarly, if we don't want to kill each other or exterminate ourselves as a species, then "society" doesn't have to feel so nasty. If you really do want to burn it all down, then by all means, go right ahead. At least that's authentic. But to choose to live amongst society, and still begrudge it, is insanely unhealthy. Literally.
Salaries depend on location. No one can give you an accurate measure without knowing location. Look at jobs you'd want to apply to in your area, some will disclose salary ranges.
Yeah, it does seem to go there: https://www.seattletimes.com/seattle-news/science/dramatic-n...
One of the many nice features of DDG is that you can fall back to Google searches trivially enough by adding a "!g" at the front of your search results. The bang syntax also works for directing searches to YouTube, Wikipedia, etc.

I value my privacy, so the few times I have to redirect a search to Google is a small price to pay. Definitely recommend making the switch.

(Of course, if Google already knows everything about you, you'll probably find their results much better tuned for you, so YMMV. I was quite amused and pleased when all the suggested search completions for—IIRC—"git" in a recent DDG search were completely irrelevant to me.)
Likewise, although it has only been recently that my opinion of human rights in the USA has declined — America takes its constitutional rights very seriously, or it seemed to until Snowden.
I suppose you could use lenticular screens like those used in some cars to avoid driver distraction[0 - old article but you get the point] or for the 3D effect in the Nintendo 3DS. This might be getting a bit silly though...

[0] - https://www.popsci.com/cars/article/2008-12/mercedes-benz-sp...
Peterloo was taught in my (Northern English) school and when I lived in Manchester I walked past the site where it happened (St. Peter's Square, near the Midland Hotel) every day.

It laid the foundations for the 1832 Parliamentary Reform Act which in turn laid the foundations for the abolition of slavery in 1833, the bedrock needed for the universal suffrage movement, and a wider sense of political entitlement for the average working person in Britain.

That in turn led to the end of the British Empire, a concept fawned over by modern day Imperialists, but was clearly a cruel and barbaric exploitation to any reader of history who looks beyond the headlines and prejudice it was built on top of.

Peterloo gave away the lie that a fair and just society can exist without fair and just democracy. Where there is bias, corruption or injustice in our democracies, we will find shadows of those injustices in our society.
I think that it’s important to keep in mind that posts consisting of feelings like these can be described as memetic. Posting opinions like this can be a way for nations to try and influence the independent actors that make up other nations. Economic or political attacks can occur with fake news type meme opinion spreading.
Canada uses Ethereum to keep track/make transparent of its spendings
Speed, efficiency, and object constancy in D3 animations
I've been using DuckDuckGo for a few months since I switched to the new Firefox. It's generally OK but I can tell that the results are just ever so slightly worse than Google. I get irrelevant results and old results. It's just obviously not nearly as smart and that's probably because it doesn't know as much about me as Google does.
Dont forget xbox live is a million times better than anything pc has
Not really. You can find the same sort of gruesome inefficiency and bad UX in systems built by similar organizations that are supposed encourage, rather than discourage activity. The deeper problem here is a focus on internal business needs (and terminology) as the "customers", rather than end users. Heck, I've seen the same basic opaqueness and clumsy, jargon-laden UX on things as simple as credit card terminals.

The only time you see really good UX for these things is in the startup (or post-startup, ie Amazon or Google) world, where UX for end users becomes a top-level requirement, and driving clicks is measured and actively improved.
Here the local authority is responsible for upkeep (though in practice they may not have the budget). Landowner responsibility is pretty much just don't block it or put anything dangerous there.
DDG even allows users to add their own search prefixes. !mmls Margaret Atwood searches my local library system for the books by that author.
a bit like "Oath of Fealty" where everything is watched with it implied "not all the time". Where you have a hint of privacy but none really at all with those who hold the keys. The real threat isn't the promises made today, its what the next guy in charge does with it.

in the US there have been concerns already raised over surveillance from license plate scanners to body cameras. The idea they won't have identifiable data flies in the face of the language used to protect law enforcement scanning license plates and its not far behind before body camera recordings are the same.
It's not as crazy as it sounds. Consider this, for example: https://www.youtube.com/watch?v=xqHrTtvFFIs

They still might not be a real threat, though. Perhaps you and Abekkus would like to register a wager with the Long Now prediction registry and betting site? http://longbets.org/
Keeping Angular Forms Type-Safe
Full Package Cydia iOS 11.2.2, 11.2.3 and iOS 11.3: Non jailbreak Install
I'm opposed to sloppy uses that don't really apply except in the most trivial sense and don't actually convey any useful information. It's a buzzword now and I'm embarrassed for programming.
What sense? To spend more billable hours at (freelance) work. :)
I've never been to either of these personally but I got tickets to both Rails Conf in Pittsburgh and Ruby Conf in Los Angeles. I am really excited for both of them. Obviously, I am a Ruby fan.
Ask HN: What are the best ICO white-papers you read?
Looking to read some interesting ICO whitepapers (not to invest). Points to consider:

- easy to understand.

- in-depth details.

- good structure.

- disruptive technology.

- avoiding marketing buzzwords.
London, Copenhagen? How about compared to a mobile dev?

But it’s true I can probably find good info by looking at job postings, thanks!
That's been my main question about this project as well. It does seem gratifying to a certain extent to use all physical objects—but I wonder if that can make up for the tradeoff of not being able to spontaneously generate any kind of object from nothing, the way we're used to when writing software.
I liked these sections.

It’s always amazing to me how many developers don’t understand marginal cost and opportunity cost and therefore misunderstand the true economic power and forces behind software.

I like how Microsoft, Google, and Facebook were framed and it was essential for the author’s point on how Amazon is trying to do for reality and real stuff what others did for digital.
You can, I'm on mobile at the moment so I can't pull a link but if you Google it (DDG it) you'll find it
Creating a Full Stack Web App from Scratch
As a former Perl programmer, dabbling in Python, I keep getting reminded how awesome Perl is.

For example: I'm collecting some stats indexed by (small) ints. In Perl, I'd just say

$collection[$index] = $stat;

Try that in Python when $index is not received in order.

Edit: Fixed typo; meant "$stat" and not "%stat"
I use DDG all the time now for personal use, but I still use Google at work.

Try this one weird trick to get only what you searched for on Google:

Click on the "Tools" link (under the search box) and change "All results" to "Verbatim" and I think (I dont know for sure) that this will only search for exactly what you typed.
Stop the madness! Comma leading in JavaScript Is it a thing?
Can't use 1Password on the iOS app. Deal breaker.
It Takes Two Neurons to Ride a Bicycle (2004)
Yes there are prices on the shelves.

https://www.recode.net/2018/1/21/16913984/what-does-photos-a...
There is a limited list on wikipedia:

https://en.wikipedia.org/wiki/List_of_Bitcoin_forks

Most forks which have no value are quickly forgotten so this might be a reliable list.
Do you make any cars which are viable in Europe?
If all you’re using is EC2 or GCE (ie: plain VMs) you’re just wasting money anyway. You’d be better served by going with one of the cheaper alternatives that only do VMs, so Hetzner or Digital Ocean or Linode or whatever doesn’t really matter...
We made a Stranger Things mobile game for Netflix that is free and devoid of IAP. It's just freely available on the app stores though, and does not require a Netflix subscription. https://itunes.apple.com/us/app/stranger-things-the-game/id1... and https://play.google.com/store/apps/details?id=com.bonusxp.le...
It's really odd - sometimes it's great or even better than Google, other times it just does really weird stuff. Putting porn at the top of the results, totally ignoring one aspect of a topic and giving 2 pages for only one meaning of the word (I assume Google has special handling for that?), when maps are shown for geographic queries seems to follow no pattern at all, ...
That does not justify this in my view. "It's easy for users to change their search habits to get the same experience they had before, so let's just change the default search for them".
Automated Text Classification Using Machine Learning
The Blockchain Is Not the World
The current trend with react reminds me of jQuery 10 years ago. It just fits like a glove. The thing you didn't know you were missing until you found it. Vue is very similar. You will start seeing react be the default option for new projects all over the industry. Yes, you should learn it now.
Lec. By Douglas Hofstadter: Albert Einstein on Light; Light on Albert Einstein