• Hugin@lemmy.world
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    1 month ago

    Most military simulation databases have a classified and unclassified version. In the unclassified database a spefic russian apc is usually set to be indestructable.

    It’s used for a quick test when setting up a federated sim. Drop one in the sim and trigger a detonation at the location. It should either be destroyed or not in all the instances.

      • Hugin@lemmy.world
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        1 month ago

        So military simulation for actual militaries is used for training. There are programs like OneSAF a training and stimulation RTS or VBS2 a first person shooter.

        They can all be networked together using a federated system. Similar to Lemmy there is no master instance. Each program is trusted and manages it’s entities like tanks and soldiers.

        They each have their own database that can be classified or not. The classified database has very accurate stats and the nonclassified has general simple stats. Think people leaking classified documents on War Thunder to get their tank better stats in the game.

        Because each system is using it’s own database you don’t want some system using classified data and some not. So in the unclassified databases a spefic unit type is set to invulnerable.

        So if it’s supposed to be an unclassified stimulation you fire up the sims and create one of the special units. You then trigger a detonation like an airstrike at the location of the unit.

        The unit should be fine as it’s invulnerable. You then go and check each stimulation and if it’s been destroyed that one is using a classified database and you need to change it out before letting people use the system.

  • Unusable 3151 ⁂@lemmy.ml
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    1 month ago

    There is a dust layer in the ice at the South Pole about 2km under the surface that interferes with about 5000 photomultiplier tubes spread out over a cubic kilometer in the ice that are watching for light created from high energy muons moving faster than the speed of light in the ice that were in turn the result of the very rare chance of a high energy neutrino interacting with the nucleus of a single atom in the ice.

    • setInner234@lemmy.ml
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      1 month ago

      Just want to make sure I am understanding this correctly: Faster than the speed of light, within the medium, right? So the neutrinos are a bit like Cherenkov radiation. But not actually faster than the speed of light, since if that was happening, my world view was just revised rather abruptly :)

      • Unusable 3151 ⁂@lemmy.ml
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        1 month ago

        You’re correct! It is Cherenkov Radiation; specifically from the muon (or electron or tau) that is a result of the neutrino interacting with the nucleus of an atom because Cherenkov Radiation happens with charged particles.

  • Lokoschade@feddit.org
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    1 month ago

    Not that obscure, but most orange cats are male since the orange gene is tied to the x-chromosom, so male cats only need one copy to appear orange. Female cats have to have the orange gene on both x-chromosom to be fully orange.

    And usually only female cats can be calico/tortoise since the orange gene is co-dominant, so if they only have one copy of the orange gene both the orange and black will be visible.

    A seemingly male calico/tortoise cat is usually intersex and sterile.

  • minnow@lemmy.world
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    1 month ago

    Diamonds aren’t stable and will eventually, over billions of years, decompose from their cubic molecular structure to carbon’s more stable form, graphite, which has a hexagonal molecular structure.

    Oh, here’s another good gemstone related one!

    Amethyst and citrine are both quartz varieties, and if the color source happens to be from traces of iron in the crystal lattice, one can be turned into the other. Heating amethyst can make citrine, and irradiating citrine can turn it into amethyst. This is because the only actual difference between the two is the valiance level of a specific election in the iron atom giving the stone its color.

      • minnow@lemmy.world
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        1 month ago

        NGL I’m not very familiar with the technical details, but I know quartz is pretty temperature sensitive and starts to get damaged about 400F iirc

        It’s possible special conditions are needed to really succeed, like low/no oxygen or a long duration at a lower temperature.

        But theoretically, the answer to your question is “yes”

    • toynbee@lemmy.world
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      1 month ago

      hexagonal molecular structure

      You know, I think I’ve heard something about hexagons on the internet before …

    • BeardedGingerWonder@feddit.uk
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      1 month ago

      The older editions are lot more encyclopaedia like too, some super detailed descriptions of things like cars - right down to the gear ratios.

  • NKBTN@feddit.uk
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    1 month ago

    I just touched my nose. Until I posted this, I was the only person who knew this fact.

    • NKBTN@feddit.uk
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      1 month ago

      But I’ll give you one of my favourite obscure-ish fact instead: baby sloths are so inept, they sometimes mistake their own limbs for tree branches, grab hold of them with one limb, let go of the actual branch, and fall out of the tree

    • DagwoodIII@piefed.social
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      1 month ago

      Naw. Steve, the FBI agent assigned to you, and Dave, my roomie, were just discussing it.

      I think Steve kinda likes you…

  • Salamander@mander.xyz
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    1 month ago

    If you catch a frog in between your hands and quickly flip it around, you can get the frog into a kind of paralyzed state called ‘tonic immobility’.

    Here is a photo from Wikipedia:

    Frog stuck in tonic immobility

    OK, well, many years ago I was very interested in this phenomenon and decided to look into the literature.

    I found a paper from 1928 titled “On The Mechanism of Tonic Immobility in Vertebrates” written by Hudson Hoagland (PDF link).

    In this paper, the author describes contraptions he used to flip animals quickly and get them into this state. They look kind of like torture devices:

    OK, but, that’s still not it… The obscure fact is found in the first footnote of that paper, on page #2:

    Tonic immobility or a state akin to it has been described in children by Pieron
(1913). I have recently been able to produce the condition in adult human beings.
The technique was brought to my attention by a student in physiology, Mr. W. I.
Gregg, who after hearing a lecture on tonic immobility suggested that a state
produced by the following form of manhandling which he had seen exhibited as a
sort of trick might be essentially the same thing. If one bends forward from the
waist through an angle of 90°, places the hands on the abdomen, and after taking a
deep breath is violently thrown backwards through 180° by a man on either side,
the skeletal muscles contract vigorously and a state of pronounced immobility
lasting for some seconds may result. The condition is striking and of especial
interest since this type of manipulation (sudden turning into a dorsal position) is
the most common one used for producing tonic immobility in vertebrates.

    Apparently this or a similar effect can be observed in humans too?! In this paper, the author himself claims to have done this and that it works! I tried to locate more recent resources describing this phenomenon in humans but I could not find them… Is this actually possible? If so, why is this not better documented? Or, maybe it is better documented but understood as a different type of reflex today? Not sure.

    • tpyo@lemmy.world
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      1 month ago

      That reminds me of a “game” kids would (try) to play when I was young at school. The kids would say to do just that “bend over, take a deep breath” and the other one would try to lift them up really quickly. I never saw it work. I guess you were supposed to pass out. Idk

      • Salamander@mander.xyz
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        1 month ago

        Some of these ‘games’ do trigger real physiological mechanisms. A well-documented example is the Valsalva maneuver, where forcefully exhaling against a closed mouth and nose affects heart rate and blood pressure.

        In some games, this maneuver (or similar) is combined with a second action that normally increases blood flow demand to the brain. The mismatch between reduced blood pressure and sudden demand can cause dizziness or brief loss of consciousness due to insufficient oxygen reaching the brain.

        Actually, there is a similar effect sometimes seen during heavy deadlifts, suddenly releasing can sometimes make people pass out. There are many “deadlift passing out” videos online.

        So, those ‘games’ can work. I have known of kids breaking their teeth after face-planting against the floor while playing those games. Not a very smart thing to do.

        • tpyo@lemmy.world
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          1 month ago

          I’m glad nothing went awry. I was always skeptical about it because no one figured it out. It’s crazy what we do especially as kids with our innocent bliss

          • Professorozone@lemmy.world
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            1 month ago

            You got that right. Lost my eyebrows once designing “custom rocket engines” with my best friend. Ahhhh, good times.

    • zipsglacier@lemmy.world
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      1 month ago

      Excellent fact, and bonus points because the fact is only recorded in a footnote of a writeup about an already moderately obscure fact.