skysight-inc/HackerNews huggingface dataset:
Tank storage is challenging because at that scale you're competing with batteries which have much better round-trip efficiency. There was a DNV GL paper earlier this year which quoted a time of about 24 hrs as the cross-over point between H2 and battery tech.

Underground cavern storage lets you do inter-seasonal storage at a very low cost per MWh.

It's critical to understand that liquid and gas fuels have uncoupled per MW and per MWh costs in a way that batteries don't. You can adjust battery chemistry of course but fundamentally you're stuck with a narrow range of peak MW / MWh performance which means that if you want to build a massive battery for inter-seasonal storage (needs MWh >>> MW) you end up "buying" discharge capacity in MW that you don't need.

Hydrogen decouples the size of the production (in MW), the storage (MWh), and the fuel cell (MW) which lets you size them independently of each other.

I am also sceptical of the need for home use or vehicular hydrogen (certainly in passenger cars). You get a lot of efficiency improvement if you are able to use the waste heat from fuel cells. Yes that can be done domestically, but putting them in large urban centres and driving district heating schemes from them seems like a much more natural fit. Especially in places like Europe where total energy demand (heat and electricity both) peak at the same time in the winter as renewable generation decreases.

N.b. there are already times in the UK grid when prices are negative wholesale. Even one of the retail energy suppliers here had a few half hourly periods of negative prices a few months ago. The subsidy for hydrogen electrolysers in The Netherlands was set assuming 2,000 hours a year of operation (using the cleanest and cheapest 2,000 hrs) since that maximises the environmental benefit with the current Dutch grid.
It's a great ROI if that one stupid thing a year is someone pushing your company's codebase and all your trade secrets to a public repo.
Depends on the impact of a single erroneous action. I’ve seen cases when folks would push to GitHub passwords (that should be kept in git to start with).
If you ask me, not at all. That's precisely what I'm working on (or at least, it's a part of the project).
C++ copy-paste compatibility with C is based on C89, since then C has introduced many features that won't compile under a C++ compiler.

ISO C++ has kept upgrading the support regarding ISO C libraries, as long as new grammar features aren't required.

Even ISO C++20 has finally added support for structure member initialisation, it is just a subset of what is possible in C.

So while UNIX vendors are free to use all C features, due to their symbiotic relationship, ISO C++ applications can only safely compile C89 code.

No full structure member initialisation, restrict, VLA,...
> the conference rooms are all numbered after HTTP status codes

Sigh, conference room naming systems! I worked somewhere many years ago where the conference rooms were named after birds of prey: falcon, kestrel, eagle, etc. The smoking room (back in the day) was informally named 'puffin'.

Almost as much fun as server naming conventions.
No, because keeping external consultants happy is not the job of the company. They only have to keep their own employees happy, external consultants are seen as temporary, cheap, illoyal and taking away normal employees' jobs. Most parts of the hierarchy (except the very top) will try to inconvenience them if possible.
Manticore: A 4096-core RISC-V Chiplet Arch for Ultra-efficient FP Computing
Oh, thank you for flightphp, I recognized you from the url used in the demo :D
Related, after telling us for years how dangerous it would be if people flew with more than 100 ml of liquid, it's now allowed (i.e. no longer dangerous?) to carry a larger quantity of hand sanitizer because of coronavirus:

https://www.tsa.gov/news/press/releases/2020/04/15/tsas-tips...
How to Do Information Extraction with NLP and Deep Learning
> This standard is not meant to define the proper method for brewing tea intended for general consumption, but rather to document a tea brewing procedure where meaningful sensory comparisons can be made. An example of such a test would be a taste-test to establish which blend of teas to choose for a particular brand or basic label in order to maintain a consistent tasting brewed drink from harvest to harvest.
If you use software-raid you can use striping.

Basically, divide up each disk into 1TB partitions, then RAID the 1TB partitions together. Synology uses this for their Hybrid RAID. Obviously care needs to be taken to not confuse partitions but this lets you use disks of differing sizes.

Unraid also offers RAID with differing sizes for disks, it has quite different failure modes though but it's been fairly reliable for me.
I believe it's all about Security (C-I-A).

To mitigate this issue, on paper, an (usually) HR policy writes "do not do non-work related stuff with your work computer". And since many people ignore this rule, because "why have a second laptop?", the next best thing is to route all traffic from your laptop through the company, and weed out the GigHubs and GitLabs of this world (in the same manner that they block all sex-drugs-rocknroll stuff).

You can't blame a company for wanted to protect itself against a disgruntled employee that wants to push the (example - not applicable to your company) ebanking software code out in the open.

That said.. why would a person use the corporate computer for their (allow me the use of the word) 'hobby'? Unless it's for charity work, most companies don't appreciate spending resources (time, money, equipment) on other things.

Re: Chesterton's Fence - didn't know it had a name, thank you for this!
If only people were willing to place all responsibility with me. I’d happily take it if we don’t have to deal with all the senseless policies/teams any more.

The bureaucracy stops idiots from being idiots. The logical solution is to not hire (or retain) idiots, not to add more bureaucracy.
Depends a lot on the company and what it's mission is, not every company needs to be able to move quickly on every front.
Overpopulation is the mother of many big problems, the resources needed to support the ever growing population are destroying this planet
I understand what you're saying, but with Facebook it's different, because it's tied to your real identity, which changes the context a lot compared to other services.

In my case, because of that, getting a Facebook account is hard, if not impossible, because those "real identity" checks are obscure: I attempted twice to sign up for work-related reasons, and I failed both times despite providing IDs and pestering support.
I have literally NO idea why I cannot have a FB account.

However, even if I could, I hate Facebook so goddamn much that if this was my only option I would rather not use VR altogether.
And I love my Oculus Rift, especially for game development.

I am royally pissed off, and I will gladly go forward with a class action lawsuit.
Show HN: Free years access to Codecademy for a year
Show HN: Poto – leave Facebook, keep in touch with your friends and family
Hi everyone,

Poto lets you easily share contact details with friends and family.

It's difficult to leave Facebook as it's often the only way to reliably contact people. I created Poto to change that, to act as a universal address book, without people needing to be on Facebook.

Because users control and update their own details on Poto, you don't have to manually add all the details of your friends and family. And you automatically have the latest contact details when they're updated so you can stay in touch.

Enjoy! And I'd love to hear any thoughts and feedback.

Best,
James
So relevant: https://www.youtube.com/watch?v=r5LtFnmPruU

Tax avoidance by the rich is the big elephant in the room!

Billionaire: "Name me one country where a top marginal tax rate of 70% actually worked?"

Historian: "The United States in the 1950s. .. The top marginal tax rate was 91% ."
> A more productive use of time would be to understand the reason for the policy, document out why it doesn't apply to your case and then attempt to get approval.

My experiences with big organizations is that the above is complete absolute waste of time, unless you are in some kind of high level position already.
I have been wondering what some of these middle managers are doing now that they aren’t inventing work for themselves in the office?

It must be awfully hard to do this from home.
In Europe (did a lot of flying lately) the 100ml still stands for sanitizers. You can go over the 100ml only if you got a baby with you and they allow the water/milk for the baby.
Only if you rent or stay far away from the hotspots. Germany has one of the lowest home ownership rates recorded at 41%.

In Munich, an average <80m2 apartment 40+ minutes away from the city center costs around 640K EUR. And if you're looking at a decent detached house we're talking about a million at the very least.

Unfortunately doesn't add up when salaries in tech are 55-85k EUR, with net income somewhere around half of that.

But yes, outside of purchasing real estate, cost of living is pretty good relative to quality of life.
Management works by creating processes and systems. There are always inaccuracies and imperfections in how these are targeted, and inefficiencies resulting.

Yet creating processes and systems is the expected task of management -- it's a key way to scale.

I'm fairly much averse to process myself, but have been occasionally involved.
On top of that, we are VERY likely gonna get either fusion or space based mining within the time we have left before exhausting the "easily" reached uranium.
It seems to me that government doesn't want you to figure out how much taxes they are actualy charging, so they split it up as much as possible. Also, when they want to increase taxes, they prefer to tax something new instead of increasing existing percentages.

Here in Belgium it goes as far as taxing for "surface water". I'm waiting for the day when they start taxing the air we breathe.
The number theory aspects here are interesting. In practice, a puzzle that slightly cheats the grid might also be interesting.
Sounds like the promise was at least made in good faith which counts for something.
One

Rich

Asshole

Called

Larry

Ellison

Among the many reasons I still turn down any Oracle offer is because of their CEO.
Anyone who has spent a bit of time trying to calculate the lost productivity caused just the meetings needed to discuss breaches (internal, accidental), knows it's great ROI.
`pagingDataAdapterOf` builder function for `PagingDataAdapter` in Kiel 1.2.0
Hi Android Fellas,
pagingDataAdapterOf builder function for PagingDataAdapter,which is alpha now, has been introduced in the version 1.2.0 of kiel.
github: https://github.com/ibrahimyilmaz/kiel

Example usage:
```Kotlin
private val adapter = pagingDataAdapterOf<EntityListItem> {
diff(
areItemsTheSame = { old, new -> old.entityData.id == new.entityData.id },
areContentsTheSame = { old, new -> old == new }
)
register(
layoutResource = R.layout.item_entity,
viewHolder = ::EntityListItemViewHolder,
onBindBindViewHolder = { viewHolder, _, item ->
viewHolder.itemView.setOnClickListener { viewModel.select(item) }
viewHolder.binding.entityTitleTextView.text = item.title

viewHolder.binding.entityRemoveRelationAction.isVisible = item.isRemoveAvailable
if (item.isRemoveAvailable) {
viewHolder.binding.entityRemoveRelationAction.setOnClickListener {
viewModel.removeRelation(item)
}
}
}
)
}

```
Any feedback, idea or PR is always welcome
Sincerely Ibra
Why is tiktok cool? Or more cool than vine or imgur.
Overfitting, fast and slow.
As a Swede it feels so weird to read about eg. Trump meddling in such details in affairs like this.

In Sweden ministerial rule is outlawed: https://en.wikipedia.org/wiki/Ministerial_governance

Our prime minister would not be allowed to have an opinion on any specific case like this, he would rather have to have opinions on the overall legal framework or such instead and leave the interpretation and application of the legal framework to the appropriate agencies.

To me that feels like the right way to go about things like this.
A complementary phrasing is to apply the subsidiarity principle ("the principle that a central authority should have a subsidiary function, performing only those tasks which cannot be performed at a more local level" – OED) to companies, which would be the antithesis of micro-management. When your boss is an enabler first and a decision maker second, they are already following a variation of that principle.

I wish there was a standard way to work against the institutionalized trust issues that creep up in larger companies. E.g. when managers can only take actions if they can show an issue exists using their (arbitrary) metrics, and not when their reports directly tell them about it.
A prototype built with the global foundries 22FDX process can do 188 gflops per watt, slightly better than the Nvidia Tesla A100, which is manufactured with the more efficient TSMCs N7 process.

The FP cores are "Snitch" ones: https://arxiv.org/abs/2002.10143 (Snitch: A 10 kGE Pseudo Dual-Issue Processor for Area and Energy Efficient Execution of Floating-Point Intensive Workloads)
I don't even know why we need Watt-hours? Joule work just fine, don't they?
More people should read this article
How to Make a Shopping App Like Wish, Only Better [9-Step Process]
The grid for jigsaw pieces is normally not square, at least when I used to solve them. Something like 3:2 was more typical.

If you can vary the aspect ratio of the average piece between 2:3 and 3:2, or even just pick one of the extremes so you can rotate the grid, a lot more numbers are possible. 1000 can be an almost-square grid.

None of this has anything to do with the mathematical content which is really the point of the blog post, but it's where my mind went when he claimed certain numbers make for bad jigsaw sizes.
Ask HN: Why are YC company posts' comments disabled?
https://news.ycombinator.com/item?id=24208501

No comments for this post.
My father-in-law is a commercial fisherman and very active ecological activist, and becomes livid at the Monterey Bay guide. I don't totally understand why but I think basically he believes it grossly oversimplies commercial seafood chains and in the process hurts producers acting sustainably, and in some cases provides cover for problematic markets before it's too late.

In his case I think this is because the seafood he produces isn't on the guides at all. It's not obscure, just not covered, but he's noticed in using the guides, people tend to avoid products they can't verify as "good". In other cases (in his mind) the guide hurts people working in markets to change the means of production to become more sustainable.

His position is that there's basically no substitute for understanding where your food is coming from. I think he sees the core problem is then disconnect between consumers and production, in that the global production chain has become so financially efficient that sources are completely obscured from purchasers.

I'm not sure I agree with him on everything regarding the guide. The global seafood market is insanely complex, and the guide helps navigate it in at least a simplified way. But I think he's right in a sense that real changes are going to require something more substantial in terms of consumer changes and /or real international regulation and enforcement. There's too much fraud and detachment from actual supply. I don't think fishing is unusual in this regard in the food supply but I do think it's different in that a lot (not all) of it involves wild as opposed to farmed resources.
> Aren't all rules imaginary?

No. The Laws of Football and the Laws of Australia are imaginary in the sense you mean, but the Law of Gravity isn't.

Mother Nature's rules are different than ours, stubborn far beyond all reason and not recorded anywhere for our inspection.

Video games are interesting because we make them, yet for the most part some of their rules are like Ma's rules not ours. Watching Mario Maker 2 troll levels, the fact is that even if the player, and the viewer, and even the people at Nintendo who made the game think that Skipsqueak can't jump through that platform, if the game was coded such that it does, it will anyway.

Anyway, I think part of what you're missing is that the people in this story often don't know the rule is imaginary. Sometimes it's an excuse, but sometimes they honestly just assumed there was a reason for things being as they are and never stopped to go find out why. Not everybody has the sort of inquisitive nature that would afford that, some lines of business crush that right out of you.
Convex/ non-convex optimisation refers to the shape of the error function
we're trying to optimise. In convex optimisation we can assume it's, well,
convex:

. . ε
\ /
\ /
\ /
\ /
'._ _.'

^
Global optimum

In non-convex optimisation we can't make any assumption about the shape of the
error function:

,--. .--. ε
/ \ / \ ,--.
/ \ / \ / \ /
.' \ / \ / \ /
\ / \ / \ /
`--' \ / `--'
^ \ / ^
| `--' |
| ^ |
| | |
| | |
`--------- Local optima ----------'

"Optimisation" means that we're trying to find an optimum of a function - a
maximum or a minimum. We're usually interested in the minimum of a function,
particularly a function that represents the error of an approximator on a set
of training data. Generally we prefer to find a _global_ minimum of the error
function because then we can expect the resulting approximator to generalise better
to data that was not available during training.

If the error function has a convex shape we're basically guaranteed to find
its global minimum. In non-convex optimisation, we're guaranteed to get stuck
to local minima.

(Ok, the above is a bit tongue in cheek, there's no _guarantee_ of getting
stuck to local minima, but it's very likely).
When circumstances change, risk profiles and trade offs change. News at 11. I mean you can rage about the unlikeliness of people concocting explosives from various liquids, but that is entirely besides the point here.
That just isn't how humans learn. You think you are teaching to not hate, but they learn that hate is normal. They want to be normal. You teach that diversity is important, but they learn that they are the undesirables or that they don't have to try in life. Just focusing on the differences puts them on different teams, and thus in opposition. It won't be otherwise.

We have seen what teaching people about this leads to, because we've been doing it for decades, and the result is not a lack of racism. You don't solve racial division with racial division.

Most of these efforts do shelter kids from history. Kids learn a false narrative that slavery was just evil white southerners enslaving black people. Nothing is said of the fact that the first slaveowner in the pre-USA colonies was a black person named Anthony Johnson, or that free blacks in the USA often owned slaves, or that black slaves were purchased from black people in Africa, or that the very term "slave" comes from the white Slavic people, or that black Africans are still being sold today, or that enslavement (generally, and particularly of black people) is endorsed by a major world religion.
Analyzing Python Code with Python · Placeholder
Puzzles are a great way to pass that Corona time at home.
Really? I see them on FB/Instagram, but I've never seen one on TikTok.
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The middle part is a bit too heady for me but I'm fascinated by this sentence in the conclusion: "I assume that you wouldn’t actually see a 999-piece puzzle because the lawyers would claim calling that 1000 was false advertising."

My soul wants to hope that nobody would be as crazy as to sue a puzzle company for having 999 pieces instead of an even 1000 but my mind is saying "duh, of course they would".

Wonder what the situation is like for those new types of puzzles that are circular or have irregular shapes. Those are probably easier to make into an even, pretty number but I feel like there would still be exceptions.
Vine doesn't exist. Imgur has a mildly toxic community and a load of porn.
I was curious how we'd go about detecting wormholes:

https://www.sciencedaily.com/releases/2019/10/191023135913.h...

> In the new paper, scientists write that if a wormhole does exist at Sagittarius A, nearby stars would be influenced by the gravity of stars at the other end of the passage. As a result, it would be possible to detect the presence of a wormhole by searching for small deviations in the expected orbit of stars near Sagittarius A.

I assume that would be a rather large worm hole, for us to detect the gravitational effects on stars that exist on the other side.

I wonder if there's any approach to detecting micro-wormholes closer to our own star? Perhaps by setting up tens of thousands of micro-satellites around (Starlink), blasting radio waves in all directions, and seeing which ones don't make it to the receiver?
Not an expert, why is it called state of the art if its accuracy is worse than mxnet, whatever that is
From your post I think you are quite young and inexperienced. There's not enough non-idiots to run companies. Having to deal with them is a fact of business, you can't simply isolate from the world. The fact that nobody is willing to place responsibility with you should tell the same thing.

To sum it up: try to talk about what you already did. So from experience, not what you would do in your ideal world.
Somehow it doesn’t surprise me Larry is a Trump supporter.
I've seen individual engineers make a mistake that caused 100 engineer's salary worth of damage.
They're measuring the same thing. Except a joule is one watt-second, which is an inconveniently small unit when talking about large energy storage like an EV battery.

It would be like road signs measuring distances between cities in inches.

Besides, energy has long been accounted for in hour-based units. Your power bill, for example. It's just easier to use those same units when thinking about storage, rather than rebasing everything around seconds.
> Interestingly, they are allowed in the quantum theory, but with one catch, the time it takes to go through the wormhole should be longer than the time it takes to travel between the two mouths on the outside[a]

> [a] This also implies that they can not be converted into time machines

This doesn't seem like "classical" wormhole, right?
How would fit TikTok into Oracles portfolio?
> That said.. why would a person use the corporate computer for their (allow me the use of the word) 'hobby'?

Because my work computer is around 100 times faster than my personal one.
There was always a medical exception, e.g. for lens solution.

However, most TSA agents do not know this unless you tell them it's a medical exception, and then they will ask a supervisor.
Luckily SpaceX is deploying Starlink to LEO at 550km, where Kessler syndrome shouldn't be much of a problem because the orbits decay in < 5 years.

I'm assuming collisions would also speed this process up.
> Recently state funding has become less and less effective because of the financialisation of academia.

That, along with the decrease in overall amount. State funding for research seems to be more limited than it used to be during much of the last century; especially if we normalize by population size.
Yes all of this, how does a regional split work?