gandalf_der_12te

@ gandalf_der_12te @discuss.tchncs.de

Posts

123
Comments

3618
Joined

2 yr. ago

Contact me on matrix chat: @nikaaa:tchncs.de

nett hat mit unterrichtsfähig nichts zu tun. Klar braucht es Mitgefühl mit den Schüler:innen aber das allein genügt nicht. Es braucht auch Fachwissen und Vermittlungsfähigkeit.

1d ago

"Viele Schüler wissen gar nicht, wie Fake News entstehen"

Wie erkennt man Desinformation im Internet.

Mmn. gar nicht. Es gibt keinen Weg zu wissen was anderswo abgeht wenn man nicht entweder selbst dort war oder Freunde hat die dort waren.

1d ago

The Physics of Data Centers in Space

This also reminds me of something else: Yes, you can have all kinds of problems in space missions. Not just bit flips.

I have been thinking about planning a mars mission. And one of the things that you need to guarantee is the safety of the crew in untested environments. Like on the surface of mars, you have to guarantee that the crew can survive at least until the next ship can arrive to help them. And launch windows to mars appear only once every two earth years (once every martian year), so crew has to survive that long.

You also have to survive when there's a power outage for any reason. Could be that the coworker stumbled over a cable and pulled out a power line's connection. Could be that there's 3-months-long dust storms (which would block solar panels). (they appear each martian year, sometimes more sometimes less severe, i think typical duration is less than 50 days, but just to be sure make that 100 days). Could be that there's a problem with your electronics and they simply won't work anymore and you can't figure out why.

So imagine you're standing in your apartment. I recommend you live inside the Starship for the first few years because it's already a habitat since you flew in it for 6 months to get to mars in the first place.

Power outage. How do you get out of the door? There's obviously a pressure door between your apartment and the outside world. And the power line's outside. So if the power line disconnects because a rover messed up and pulled it out, there's a power outage. And if the door is electrically operable, you can't get out of the door to repair it. That is why i say that every door has to be manually operable. Like, pressure doors should have manual operation mode. You need to be able to operate the pressure door with your bare hands. I already thought of some designs that can actually deliver that, but i'm too lazy to do a drawing now.

1d ago

The Physics of Data Centers in Space

Like, very interesting article. It also mentions bit flips.

I think the major protection against bit flips is to use larger structure sizes. Like, today's desktop computers use structure sizes around 2 nm or sometimes even less than that. Which means you only need to shift a few electrons around to cause a bit flip. If you use larger wires inside the processor, they store more electrons so it takes more energy to flip them around. So there's a much much smaller number of radiation particles that have a minimum of that energy, so lower risk of bit flips.

Does anybody have actual numbers on the structure sizes needed to effectively prevent bit flips? I mean, outer space missions like NASA flights already need this today.

1d ago

The Physics of Data Centers in Space

You know how much it costs to transport stuff into space? Well, currently, around $1k/kg of material. Let that sink in.

Note this is only payload. Ship's own weight is already included in this.

1d ago

AI Added ‘Basically Zero’ to US Economic Growth Last Year, Goldman Sachs Says.

Yeah i thought the same thing.

I asked it for a complete list of all fissile materials and it said it's basically only three: Thorium-232, Uranium-235, Plutonium-239 or sth like that. I asked repeatedly whether there were no others, and it assured me it's only these three.

Well, three months later i actually bothered to check and read up on Wikipedia. Turns out there's a looong list of fissile isotopes, like at least 20 of them ...

1d ago

AI Added ‘Basically Zero’ to US Economic Growth Last Year, Goldman Sachs Says.

Meanwhile most electric utility and metal works companies have gone up 75% on the stock market ... i wonder why that is

(i actually don't, i know why it is, it's because cheap renewable energy boosts all heavy industries)

1d ago

"You look great! How'd you lose all the weight?" "Ozempic helped."

TL;DW: a shart

1d ago

Singing is just talking with more tone variations.

Nope. there's three domains that are typically distinguished: the biochemical, mechanical, and neural level.

You wouldn't call a thinking process a "motor activity" since the ideal neural net has practically no moving parts, similar to an ideal computing machine.

1d ago

Singing is just talking with more tone variations.

No i think there's also rhythm to it.

Fun fact: Many people who stutter can sing just fine.

I attribute it to the fact that music enforces a certain rhythm and that makes you move on with your speech more fluently than you would otherwise do.

I think i should know that because i also used to stutter a bit earlier in my life. I never got the hang of talking. I started adding a bit of rhythm to my speech, so when i talk it always has a certain rhythm in its background. If you actually listen, you could notice. It's subtle, though. It helps me stutter far far less. :-)

1d ago

Wimmelndes Leben in unserem Kühlschrank

Im Allgemeinen ist jedes Küchenutensil das nicht-glatte, versenkte Oberflächen hat nicht sauber zu putzen und es ist daher davon auszugehen dass es mit allerlei Unrat kontaminiert ist. Das gilt auch für jegliche Saftpresse, Kaffeemaschine, Mixer, usw.

Daher verwende ich ausschließlich Töpfe und Pfannen die glatt und sauber auswischbar sind und sonst gar nix! Alles andere ist Dreck (im wahrsten Sinne des Wortes) spätestens nach der ersten Benutzung.

1d ago

Can a reasonable person genuinely believe in ghosts?

IMHO "ghosts" is just an older word vor virus.

People in earlier times knew that some diseases jumped around from person to person and that that could be dangerous, but didn't have a proper explanation for it.

So they assumed that there must be something invisible in the air that creates the kind of spooky effect that people fall ill sometimes without being touched or physically hit in any way. Kinda spooky, if you think about it and only know about mechanics, but not about cellular biology.

4d ago

I am a 15-year-old girl. Let me show you the vile misogyny that confronts me on social media every day | Anonymous

gandalf_der_12te @discuss.tchncs.de 4d ago

It's all random bullshit. Reality is just monkeys on typewriters. You can safely ignore it. Don't let it ruin your day.

1w ago

Europe is ready to ditch US tech for private alternatives

right, i misread it as ممكدن

1w ago

Europe is ready to ditch US tech for private alternatives

yes, german has a very weird way of writing numbers, where . is replaced by , and , is replaced by .

So, in US numbers, that would be EUR 274,091,361.75

It has confused many people already. It should be made more consistent internationally. I propose all use the US format of 274,091,361.75 because that's already used in programming and so it's widespread.

1w ago

Europe is ready to ditch US tech for private alternatives

To give a bit of technical details, the hardware must have a feature to destroy encryption keys for user data whenever a new OS is installed on it; and you have to be able to install a new OS on it at all.

Like, today, many smartphones have the problem that you can't install a new OS on them at all, because the bootloader doesn't allow it. Meanwhile PCs have a different problem, where they do allow installing new OS, but the user data is typically not encrypted and so you can just boot linux from a USB device and read all contents on the internal disk.

The best solution might be to encrypt all userdata, store the keys in the bootloader on the device, but when a new OS is loaded/installed, the bootloader doesn't give out the keys so the userdata can't be decrypted.

1w ago

Europe is ready to ditch US tech for private alternatives

thrirha klha ~~mmkdn~~ mmkn

i'm currently learning arabic. did i get your name right?

1w ago

How horses fly on planes

sry i didn't intend to be mean 😅 have a nice day too!

1w ago

A drone can lift itself only through the power of a solar panel