sehansen
sehansen on Hacker News
The forms of vitamin A you get from carrots and other plants (called carotenoids) aren't toxic, but the form you get from animal products and supplements (called retinols) can be. The US recommended daily intake for an adult male is 900 μg, which is also the recommended daily maximum for 4-8 year old children. This maximum includes a hefty safety margin, so there's no reason to worry if your children eat the same food as you.
Except if you really like liver. Chicken liver contains more than 4000 μg/100g and the liver of other animals contain more. And then you start skirting dangerous levels. Apparently Inuits would avoid eating liver for this specific reason and a few Arctic explorers became ill partly because of this.
Sources: the Wikipedia articles on Vitamin A and Hypervitaminosis A, so reader beware.
https://en.wikipedia.org/wiki/Vitamin_A
https://en.wikipedia.org/wiki/Hypervitaminosis_A
China invaded Vietnam in 1979. In response to Vietnam invading Cambodia, to be fair. But that's still an invasion in my book.
If you're referring to "If the main signal is a (train station's) exit signal ("Ausfahrsignal"), this speed limit applies until the last set of points/switch has been passed by the complete train, after which regular speed is permitted.", I think that means "once you see a normally working signal again, if it's of a specific type (the exit signal), you still have to stay at 40 km/h until you have passed all switches.". As far as I understand the article, Zs1 is mostly intended for very local speed reductions, the kind of speed caution relevant to this discussion sounds more like the Zs7 signal.
$1/kWh is ludicrously expensive. It's only hit that level for a handful of hours here in Denmark across the last decade. Most years the most expensive hour doesn't even clear $.70/kWh and it doesn't stay at that level for long. In the past year the spot price only cleared $.50/kWh in 24 individual hours and the longest stretch was 4 hours. Most days the price doesn't even hit $.30/kWh during the evening peak. So there isn't really that much opportunity to make up for the low prices the rest of the time.
rrr_oh_man is claiming that wholesale fixed rate electricity is generally cheaper than varible rate domestic electricity. Or that the wholesale-bit is higher order than the variable rate-bit. Not that it's a big issue, bob1029's point doesn't actually care about one situation being wholesale. It's just a somewhat narrow, (in this case) inconsequential, but also valid, nitpick.
The reason is people don't want to specify the full set of requirements to that podcast app ahead of time. You can spend your year and $500,000 and then the users will play around with it for ten minutes and then tell you it needs to do this and that as well. And one of those features requires you to go back and make fundamental changes to your architecture making you redo a lot of your subsequent work, including a lot of the formal verification.
So it is harder because there is so much freedom in terms of what features a program can have and what the set of requirements can be. And that's just for getting to version 1.0. Software is expected to change much more than hardware is and if the requirements for version 1.7 can only be met by a severe change to the architecture or an ugly hack, the ugly hack will look very tempting.
Having said all that, I'm not sure I disagree all that much with you. A lot of this could be improved with more big E Engineering in the software world.
One way could be with some kind of professional engineer certification. It should be reasonably easy to get the first time by passing a test on some hard and concrete software engineering principles. But if you are ever found to break them, you lose the license and will have to go through a lot to get it back. That of course only works if companies care about people having this certification.
Which leads (as you mention) to government regulation. As someone who works with medical device software I can see that it actually works. The regulations succeed in forcing us to figure out a reasonably complete set of requirements early, but it is an ordeal. For a recent project we had working prototypes for basically all functionality and still we spent four calendar months doing nothing but requirements before we started developing the actual product.
And yet medical devices still have software bugs. There are 24 software related recalls in the FDA medical device recall database just this year so far: https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfRes/res...
Leapmotor sold 19700 cars in total in Europe in the first half of 2026. That's across three models: the T03, C10 and B10. The T03 accounted for half of the sales at 9400, so ~1600 a month. That's quite a bit below the 20th best seller in GPs link, the Volvo EX30 at 3649 sales in August 2026.
Source for Leapmotor sales numbers: https://ievchina.com/brands/leapmotor-stellantis-europe-upda...
If they'd done those two things Wordpress would probably have been far less successful. Which certainly is a way of making WP Engine not even want to do what they did. Heck, they would probably not even exist.
US and European payers aren't paying for neither R&D nor amortization. They're paying a negotiated price that depends mostly on how much value the drug provides to the patient and the health system. The costs for the producers aren't really a factor.
I wonder what they call maize in Egypt then?
According to Kagi Translate, a term for maize that's specific to Egypt is "الذرة الشامية" (al-dhura ash-shāmiyyah) which could be directly translated to "Levantine sorghum". Can anyone with actual knowledge of Egytian Arabic confirm?
Also I had the idea that "Maize" might have come from "Mısır", but etymonline claims it comes from the native (Arawakan) name for the plant: mahiz.
800 lbs is 360 kg, but I think you meant 600 lbs per cow. Still seems realistic.
No, ARM means "Acorn RISC Machine" and was developed by Acorn Computers, a British computer manufacturer, because the 8-bit MOS 6502 they had based their previous designs on was obsolete, available 16-bit processors "a bit crap"[0] and available 32-bit designs too expensive. So the ARM ISA was developed by a computer manufacturer for use in their own chips in their own products, quite far from an "academic exercise".
0: https://www.youtube.com/watch?v=Hf67JYkUCHQ at 7:35
It't not a matter of generations. There are plenty of old mathematicians who are very interested in applications and plenty of young mathematicians who are only interested in generalized abstract nonsense. It's more of a difference in personality that will always be there.
Fish and rice isn't synonymous with sushi. Grilled fish, tempura-fried fish and soups with pieces of fish are all popular in Japanese cuisine.
I can't speak for the others, but ST has six fabs in Europe and only one in asia. ST's smallest process node is 18 nm and made in their fab in Crolles, France. In any case trying to compete at the cutting edge of process technology seems to be too expensive to be worth it.
If "closest star" is Proxima Centauri, we're talking 4.5 light-years. Getting there in 1000 years means an average speed of 0.45% of the speed of light. At that speed less than 0.01 cm of titanium is enough shielding to keep the radiation out according to figure 1c) in my source below. Which makes sense because because this is ~10% of the speed of "normal" alpha radiation which is stopped by just your skin.
"Radiation Hazard of Relativistic Interstellar Flight" by Oleg Semyonov: https://arxiv.org/abs/physics/0610030
via
Project Rho: https://projectrho.com/public_html/rocket/slowerlight3.php
Unfortunately that inside source is often coached by the PR department and are just there to say things they can't get away with saying publicly or don't want to have their exact words on record. I.e. just as much a misrepresentation as the official press releases. Or sometimes even more of a misrepresentation since nobody can actually be held accountable for their words.
No they didn't. They had a hiccup in 2020 when the transition to electric cars really started accelerating but after they got their own electric cars into mass production they've reclaimed the top spot at 13.9% of the Chinese market. That's just ahead of Geely at 13.8%, Toyota at 7.8% and BYD at 7.1%.
It was hard to find reputable numbers for all of Q1, so my source is only for january and february: https://www.reuters.com/business/autos-transportation/volksw...
In a nuclear energy context "closed cycle" just means that the uranium and plutonium is separated out from the spent fuel for future reuse. The loop is only closed in the sense that some of the spent fuel material that leaves the reactor will enter it again in the future. It doesn't imply that new inputs won't be added to the loop.
https://en.wikipedia.org/wiki/Nuclear_fuel_cycle_in_France#C...
A lot of normal people I know used to love maps.me but have become dissatisfied with the ads and other unwelcome commercial elements. They would definitely chose coMaps over Organic Maps just to lessen the risk of that happening again.
Yeah, with how much focus there is on the capital costs of nuclear power plants it's easy to forget they also have moderate operating costs. With the developments we're seeing, you're right that the LCOE of solar and wind is or will soon be lower than the operating costs of nuclear. That leaves the only remaining upsides of nuclear being production stability and energy diversity, and grid batteries are making the first less and less important every year. Not to mention that the capacity factor will be pushed down from the demand side worsening the costs even more since not all operating costs are proportional to the amount of energy generated.
Quite a lot of open source hardware is licensed under the BY-SA Creative Commons license which is an actual open source license. E.g. the Arduinos and things like the Milkymist One which can actually run linux.
An already built nuclear plant is cheaper than building new solar and wind, which is what this article is about. It had already started operational tests at 5% capacity when it was shut down.
And nuclear power doesn't inherently emit CO2 (or equivalents), which is what is meant by zero-carbon in this context.
If your location already has a well-run nuclear energy sector (Finland, Sweden, South Korea): invest in nuclear energy.
If you don't: stick to renewables.
And it also depends on what you mean by "we". As a Dane, I don't think us Danish taxpayers should invest in nuclear energy, but I'm perfectly happy that private Danish investors invest in Seaborg/Saltfoss and Copenhagen Atomics.
Cool game. Too bad you didn't include "oranges" on #4
DRAM hit a barrier at 10 nm a few years ago[0], so 16 nm is actually even closer to state-of-the-art. E.g. Micron newest node (1-γ) is their sixth at 10 nm [1] and their first EUV-based node.
The problem is that DRAM is fundamentally based on storing charge in a capacitor and how much charge a capacitor can store is a result of the geometry of the capacitor. So either someone will have to figure out a way to make the same size capacitor take up less space on the RAM chip (this is what broke the previous 20 nm barrier) or someone will have to invent a practical way of making RAM with less than 1 capacitor per bit.
0: https://semiengineering.com/dram-scaling-challenges-grow/
1: https://www.techpowerup.com/333111/micron-announces-shipment...
Hmm, so memory is actually still cheap compared to historical highs. At least cheap relative to other computer components.
France does have parallel gas infrastructure though. It's, funnily enough, at around 10% of their electricity supply.