schiffern

5 ms·

31.
by schiffern 2mo ago
>In my dreams, my ultra-advanced car would open the windows when braking to get two benefits in one. Or use those triangular vent windows / wing windows, as seen on old trucks and classic cars. https://www.fastlan
32.
by schiffern 2mo ago
That's the regular A350-1000. This is the A350-1000ULR, which has an additional 20,600 L rear tank. https://www.airbus.com/en/newsroom/stories/2026-07-extending...
33.
by schiffern 3mo ago
I expect many researchers are using fresh lab-made microplastics, which are indeed mostly harmless. However part of the problem is that real-world plastics are chemical sponges that absorb toxins (heavy metals, PCBs, etc) from the environme
34.
by schiffern 3mo ago
Correct. This is why SpaceX rejected using black coatings alone for Starlink. Mirrored surfaces that they tested instead were darker than VANTA black.[0] On some surfaces they use a SpaceX-designed coating called Low Reflectivity Black,
35.
by schiffern 3mo ago
CO2 on the ISS routinely gets up to 5 mmHg = 6,500 ppm, because the CO2 scrubber is more effective at that concentration. According to NASA it's "not practical from a hardware standpoint" to set the operational CO2 limit at
36.
by schiffern 3mo ago
Skeptical? I was too. Check out the interview with Dr Bernie Cohen, who did a lot of the early epidemiological work. The interviewer is rather woo, but the professor is as hard-nose a scientist as you could hope for. It makes a good pair b
37.
by schiffern 4mo ago
Yes. It was the urine processor that had problems with excess calcium, not the air scrubber. https://ttu-ir.tdl.org/server/api/core/bitstreams/f8ca865b-1...
38.
by schiffern 6mo ago
Mostly your post is just about the side-issue of whether (in 20/20 hindsight) the censorship in the USA was justified. However this ignores the fundamental double-standard toward the USA vs the UAE. In 20/20 hindsight the UAE cens
39.
by schiffern 6mo ago
>In most of the world such photos would be deemed of public interest and shared OTOH, anyone remember "loose lips sink ships?" Beyond the famous poster, it was backed up by robust censorship laws.[0][1] You might say i
40.
by schiffern 6mo ago
Yes I just mean the more expensive tea on the shelf. On cheaper SKUs they're trying to cut cost so they use normal tea bags. The plastic sachets were a trend for a couple years but hopefully most brands have switched away. That study i
41.
by schiffern 6mo ago
The kicker? It's only on high-end tea, because it's more expensive than regular tea bags.
42.
by schiffern 6mo ago
Agreed. MERV 11-14 can be far more effective than HEPA. If you need to filter "one and done" (like pumping air into a hospital operating room), that's where you need HEPA. Most home air purifiers mix the clean air back into
43.
by schiffern 6mo ago
That helps for pollution that comes from outside (traffic, pollen, wood smoke), but most of the microplastics are generated by moving/wearing synthetic textiles inside the home. Positive pressure systems are great, love 'em, but t
44.
by schiffern 6mo ago
A false sense of security can be worse than nothing, because it prevents you from seeking out actually effective options. I too would like such a "shy" air purifier, but manufacturers always seem to go the other way: when occupa
45.
by schiffern 6mo ago
>microwaving in plastic bowls More generally, never let hot food touch plastics. The high temperature is what damages the plastic surface, not anything special about microwaves. For instance the same thing happens with plastic te
46.
by schiffern 6mo ago
https://archive.ph/UcCq6 Saying HEPA filters remove "99%" of microplastic is pretty misleading. Most of the mass in airborne particles is in the larger sizes of visible dust. However these particles will "fal
47.
by schiffern 6mo ago
Transport doesn't "go to zero." Terrestrial transportation is already fully reusable, so it doesn't have the same cost headroom for improvement vs orbital launch. Thanks, I really needed this post. I'm saving this f
48.
by schiffern 6mo ago
>Here's an AI-generated fake video of large transformer manufacturing. It's about half wrong.[2] But right enough to be worth watching. Which half? You probably got a lot from this video, because you know which half is
49.
by schiffern 6mo ago
>that’s not good enough for real world manufacturing and simulation Dumb question: why not?? It's working for that guy and his 3D printer apparently, which is "real world" (though one could certainly argue it'
50.
by schiffern 6mo ago
This is why geometric kernels are the gateway to madness. ;) Thanks for the clarification.
51.
by schiffern 6mo ago
With today's very high orbital launch costs, it's trivially true that the desert is cheaper. With very low orbital launch costs, it's trivially true that space would become cheaper. Solar panels have no atmosphere/night&
52.
by schiffern 6mo ago
>corners where 3 fillets meet I would imagine there are a few different possible options (preferably a settable parameter): * Intersection. Conceptually the simplest, the chamfers would just be joined by the solid addition of all
53.
by schiffern 6mo ago
By the same standard, Chrome itself is "a tool to download files from Google's servers." Chrome doesn't only download from Google's servers, but the same thing applies to yt-dlp. I'm equally not "surpris
54.
by schiffern 6mo ago
A rate of one collision per year per 10,000 satellites, in low orbits where debris is quickly removed by drag, is perfectly manageable.
55.
by schiffern 6mo ago
Or just stochastic impacts with debris too small to track. Objects >1 cm are fatal to satellites, but ground radar can only track objects 10 cm or larger. The two scenarios are pretty easy to distinguish. If the explosion occurred near t
56.
by schiffern 6mo ago
I see you still don't say microplastics are rare. Violently agreeing with each-other, it seems. ;) Synthetic textiles (clothes, upholstery, carpet, dryer exhaust, washer drainage) are of course the biggest culprits, with most of that t
57.
by schiffern 6mo ago
Plastics aren't just plastic , unfortunately. Plastics are chemical "sponges" that will soak up pollutants over time from the environment (brominated fire retardants, bisphenols, PBCs, pesticides, phthalates, heavy metals, e
58.
by schiffern 6mo ago
Thanks and noted, I'm happy to accept your figure. Even at 40% by number density that still means microplastics are hardly rare. I don't need to nitpick the exact number. It was just an aside anyway. My main point is that MPs are
59.
by schiffern 6mo ago
If anyone wants to actually use this, here are some uBlock Origin filters for the ISP-specific elements you probably don't need (remove the carets "^" for uBO Lite, it removes elements directly from the HTML to prevent flicke
60.
by schiffern 6mo ago
The problem isn't just the plastics themselves. Plastics are chemical "sponges" that will soak up pollutants over time from the environment (brominated fire retardants, bisphenols, PBCs, pesticides, phthalates, heavy metals,

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