• 6 Posts
  • 21 Comments
Joined 2 years ago
cake
Cake day: June 9th, 2023

help-circle


  • Yeah, I concede that small caps are more likely to be carried away by rainwater than whole bottles :D. What I meant was that for every loose cap on the ground there is a bottle lying around somewhere, and also there are bottles with caps on. No one is tossing their cap into the bushes and then taking the bottle to the recycling center.



  • TauZero@mander.xyztoScience Memes@mander.xyzIrresistible
    link
    fedilink
    English
    arrow-up
    6
    ·
    6 months ago

    For an object heavier than the Earth, 1g radius will be greater than the radius of Earth. For 56 Earth masses that’s sqrt(56) times bigger = 48000km.

    A 56 Earth mass black hole will take 5.5e55 years to evaporate according to this calculator. A 100kg black hole (more close to what Richard used to be) is much smaller than the nucleus of an atom and will evaporate in 0.05 nanoseconds.

    Curiously there was a paper recently that calculated that even if there was a small black hole in the center of the Sun, it would take millions of years for it to grow, because the aperture is so small not much can fit through, and the infalling gas heats up so much as to repel the rest, creating an internal hot bubble.


  • TauZero@mander.xyztoMildly Infuriating@lemmy.worldTethered Bottle Caps
    link
    fedilink
    English
    arrow-up
    7
    arrow-down
    1
    ·
    6 months ago

    I pick up street litter, and having picked up thousands of pounds, I have never felt that loose caps are a problem, let alone one that requires such a solution. The number of littered bottles, with or without a cap, is greater than the number of loose caps, and the amount of plastic in every bottle dwarfs the plastic in a cap. Fixing the cap to the bottle will do nothing to improve the recycling rate of plastic if entire bottles are already tossed anyway.

    I consider the idea of cap tethers as adversarial memetic warfare thrust upon us for some unknown ulterior purpose, possibly to make us hate the very idea of environmental consciousness. Same as paper straws. I like plastic bag bans though.

    As far as picking litter is concerned, I personally prefer finding bottles without a cap. At least those are empty, all liquid having evaporated after the bottle has spent several months in the bushes. The capped bottles are often half-full and are just nasty. (Who even pays for a bottle of drink and not drinks half of it anyway?)


  • It is important to remember that, unless accompanied by convincing evidence for selective advantage, any single inheritable trait is more likely to have arisen from genetic drift, not from natural selection! There is, in my opinion, too much focus on conversation about superficial phenotypic traits like “shape of the nose” this and “angle of the eye” that, all the arguments about how one is better than another. Could the asiatic epicanthic fold give advantage against icy winds? Maaaybe… But it doesn’t even have to. What about the asiatic dry earwax gene? You’d struggle to even come up with a story of how dry earwax or wet earwax is actually better under certain conditions, or you could just say “it’s a single nucleotide polymorphism that could have spread by genetic drift” and be done.

    Very few human traits have definitely been naturally selected for: light skin in non-sunny climates for better vitamin D production, sickle cell gene for malaria resistance, lactase persistence for animal milk consumption. Even there, the estimated selective advantage is actually much smaller than you’d expect: lactose tolerance confers only something like 1% advantage! There are many more possible neutral mutations than advantageous ones, and each one has a chance to be fixed in the entire population by genetic drift, meaning that any widespread human trait that is less clearly advantageous than lactose tolerance is more likely to be neutral than advantageous at all.

    Even mildly disadvantageous mutations can be fixed by genetic drift, especially in humans since we have had many bottlenecks and founder effects. There was an area in Appalachia populated by blue-skinned people due to founder effect. No one is going to try to argue how having blue skin was actually advantageous for them to blend into their environment! There is an area in Dominican Republic with a very high rate of children born intersex, again due to a founder effect mutation. They are not considered exceptional and live normal lives as their culture has adapted to treat them as routine, as a kind of third gender. But they are not some kind of new level of human evolution, an adaptation for an intersectional era!

    The only mutations that definitely cannot spread by genetic drift are those that definitely kill you.



  • I was apprehensive about EVs but the first time I rode in one I immediately fell in love with it. I get carsick easily, and the super-smooth ride without the chug-chug-chug of an internal combustion engine made the experience surprisingly much more pleasant for me. I do not use a car, but if I had to buy one, I don’t think I could ever stomach an ICE again knowing that this alternative is available.





  • Oh! They don’t mean that black holes must come in perfect pairs! The headline makes it sound like it’s about wormholes across vast distances. No! What they’ve found is a stable “orbit” solution for the two-body problem. Normally when you place two bodies anywhere in an empty universe, they will gravitate towards each other until they collide. But in a universe with dark energy, there is some perfect distance between them, where the accelerating expansion perfectly counterbalances the accelerating attraction. They’ve used general relativity math to actually calculate such an arrangement.

    The “stable” orbit in this case is the same kind of stable as a pencil balanced on its sharp tip - if it tilts even slightly one way it will fall out of control. Although they tantalize the idea that they might be able to make it truly stable against small perturbations once they finish their spinning black hole solution.

    I would like to have known some specific numbers examples! Like if you have as much dark energy as our universe, and two 10-solar-masses stellar black holes, how far apart would that be? Is it like 1Ly or 1MLy? How far for two 10-million-solar masses supermassive black holes? The formulas they created should give the exact answer but I am not skilled enough to substitute the correct numbers for the letters.



  • Echoes of the Eye expansion to Outer Wilds. I managed to avoid all the spoilers, watched some playthroughs but thankfully didn’t study them too closely. Importantly, the streamers never looked “up” during the parts of the gameplay that I’ve seen, so to me it appeared just like another normal environment (well, normal at least by Outer Wilds standards). I already loved the original game, and decided I must play this for myself.

    So when I entered through that doorway for the first time I was genuinely stunned. “You fuckers, you really did it this time. You actually went ahead and did it!” I mean…

    spoiler

    Space habitats have always been a staple of science fiction novels, and they have appeared a couple times in video games already, like in Mass Effect and Halo, but there they were only used as background - the actual playable area was limited. Never before this had anyone successfully implemented a life-size Bishop Ring with the full “You see that mountain? You can walk there!” boastfulness. And sometimes that mountain is on the ceiling. And when the water breaks, oh boy…


  • Yup yup! In a just world, if you have 100,000 workers at a factory, and then they get replaced by robots maintained by 1000 robot technicians, you should have ended up with a Star Trek utopia where 99,000 people now don’t have to work and can pursue culture and passions. In the real world, the factory product price gets halved, the technicians get paid 10x what a worker used to get (20% of total revenue), and the factory owner gets 80% of total. The former workers are now jobless, homeless, and penniless and can’t afford the product they used to make.

    They tell us “Replacing jobs is OK! We’ll invent more new kinds of jobs, as old obsolete jobs free up labor. Everyone will be better off!” but the new jobs are mostly “telemarketer”, and “tech support scammer”, and “ornamental hermit” at factory owner’s mansion.

    But all that still doesn’t convince me we should be smashing the robots as a job protection scheme. I wish there was a way to keep the automation and have the Star Trek utopia instead!






  • If the black hole specifically disappeared, it would have no effect on us. The solar system would not even be launched on a 100 million year trajectory out of the galaxy, as galactic rotation is dependent on the masses of stellar and interstellar matter in the disk and dark matter in the halo. The supermassive galactic black holes, despite being supermassive, still only make up a tiny percentage of total galactic mass.

    If you want to wow your friends, tell them about false vacuum decay. We could have bubbles of true vacuum expanding out in space from multiple directions towards us at lightspeed, and no way of knowing about them, stopping them, or outrunning them. Any point in space could nucleate a new true vacuum bubble at any time, just like a given uranium atom could decay now or in 5 billion years or never. Even spookier, by principle of quantum immortality, the Earth could have been engulfed by vacuum bubbles many times before, and we are just the one tiny sliver of probability space where by luck alone we survived long enough to talk about it here and now.

    Thankfully false vacuum is just an idea and there is currently no evidence that it is real.


  • The year is 2025. A massive geomagnetic storm has fried all forms of technology, wiping out hard drives and solid-state drives alike, and scrambled all backup tapes. Coincidentally, a new plastic-eating bacterium has munched on all the compact discs without anyone noticing.

    Humanity will rebuild…

    The computer chip manufacturing pipeline has been restored, but there is no software to run them. In a dusty office previously owned by a lawyer from a long-defunct dotcom, a treasure trove is discovered. Five metal cabinets filled with paper: the printed Linux kernel source code, in 5-pt comic sans font. One brave soul will enter to transcribe. Mistakes are not an option. We all thank you for your sacrifice.


  • Btw, old reddit used to display the exact upvote/downvote counts (“x upvoted, y downvoted”) for posts AND comments in the “title” attribute of the total number, visible as a tooltip when hovering the mouse over it. All that “x% upvoted it” for posts and removing the counts entirely for comments was nonsense pushed through by the previous reddit jerk CEO on 2014-06-18 against all community opposition (what is it with reddit and dumping unpopular changes in June?).

    If you gonna recreate old reddit, please do not include these later CEO meddlings in it! One of the best features of lemmy is the display of exact counts (which was also a major advertised draw of voat.com and raddle.me before it). Let’s keep that in!


  • Meh. It’s one thing to not like children, but here this seems to have been your real problem:

    my normal 20 min wait it was almost a 2 hours wait. I just walked out.

    We, uh… live in a society. You don’t get to feel entitled to be served at an advantage over other people. We all have to share all these natural resources and the labor of all these workers. But more people is not a bad thing. What’s next, you gonna complain that all these immigrants are clogging up the line to the drive through, or that all these old people are making you wait long time at the doctor’s office? Everyone is entitled to life. And in truth more people means more workers means more benefit to you and everyone on average.

    Yes, you feel that this barber shop in particular was targeted towards adult audience with its shave service and whiskey bar, but apparently all those moms saw something useful in that service too, and more importantly they were all willing to pay for it. If this shop was so exclusive and upscale, then how could those kids even afford it? Yet they are customers too apparently.

    I feel that way too sometimes, like when going to the movies - if I pay $20 for a ticket, how can all those kids in front of me cough up the money, when I remember paying $5 per movie as a kid myself? And yet they paid too, so we are all in there together. If I really didn’t want to share space with other people, I could go look for a $50 movie theater with individual “bedroom” cubicles. As could you. You could outspend all those kids and find an even more exclusive and expensive barber service, by appointment-only. I’m gonna tolerate the kids and keep my money. 😂