• radicalautonomy@lemmy.world
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    2 months ago

    I can read UPC, ISBN, and EAN bar codes. Tear the numbers off the bottom, hand me the lines, and I can tell you the numbers you tore off. Also, if you give me any specific date on the Gregorian calendar (on or after October 15, 1582), I can tell you the day of the week it was or will be on.

    Finally…way less interesting…but I have a Master’s degree in math and have taught elementary, middle school, high school, dual credit, and college math classes.

  • bunchberry@lemmy.world
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    2 months ago

    Reading books on natural philosophy. By that I mean, not mathematics of the physics itself, but what do the mathematics actually tell us about the natural world, how to interpret it and think about it, on a more philosophical level. Not a topic I really talk to many people irl on because most people don’t even know what the philosophical problems around this topic. I mean, I’d need a whole whiteboard just to walk someone through Bell’s theorem to even give them an explanation to why it is interesting in the first place. There is too much of a barrier of entry for casual conversation.

    You would think since natural philosophy involves physics that it would not be niche because there are a lot of physicists, but most don’t care about the topic either. If you can plug in the numbers and get the right predictions, then surely that’s sufficient, right? Who cares about what the mathematics actually means? It’s a fair mindset to have, perfectly understandable and valid, but not part of my niche interests, so I just read tons and tons and tons of books and papers regarding a topic which hardly anyone cares. It is very interesting to read like the Einstein-Bohr debates, or Schrodinger for example trying to salvage continuity viewing a loss of continuity as a breakdown in classical notion of causality, or some of the contemporary discussions on the subject such as Carlo Rovelli’s relational quantum mechanics or Francois-Igor Pris’ contextual realist interpretation. Things like that.

    It doesn’t even seem to be that popular of a topic among philosophers, because most don’t want to take the time to learn the math behind something like Bell’s theorem (it’s honestly not that hard, just a bit of linear algebra). So as a topic it’s pretty niche but I have a weird autistic obsession over it for some reason. Reading books and papers on these debates contributes nothing at all practically beneficial to my life and there isn’t a single person I know outside of online contacts who even knows wtf I’m talking about but I still find it fascinating for some reason.

  • RebekahWSD@lemmy.world
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    2 months ago

    I play a mud called Starmourn. I know the archeology system very deeply, including how long it takes for your npc dig site members to dig, what the two stages of digging are, and what a supervisor actually does (…not as much as you’d hope, but more than you’d fear)

    I also know designing in the game, but they’re are many people in the game that design!

  • Tiefling IRL@lemmy.blahaj.zone
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    2 months ago

    I’m a professional fire performer/circus sideshow performer at a historic venue. I know a lot about the weird, morbid, and obscure. I’m fun at parties :)

    • CallMeButtLove@lemmy.world
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      2 months ago

      You should grind everything up to 99 and do like that one person and max them all out one after another at the same time.

      Edit: Ah, nevermind, I didn’t realize 99 was the max.

  • greencactus@lemmy.world
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    2 months ago

    I’ve delved way too deep into the fall of the Western Roman Empire. I think I know a lot about Majorian, Stilicho, Aetius and Ricimer. My gf at this point even knows who Honorius is and why he was a bad emperor.

    When I saw the meme “How often do you daily think about the Roman Empire”, I knew that it was about me, because the answer is yes :/

      • greencactus@lemmy.world
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        2 months ago

        Thank you! I really appreciate it. I think so too, especially because learning history provides one with a better understanding and contextualization of current events. I’m still wondering why exactly I picked the Roman Empire, but I also think that’s a pretty nice topic to delve into :)

        Once again, thanks for your comment - it really matters to me!

  • illi@lemm.ee
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    2 months ago

    Though currently on hiatus, I do HEMA (historical european martial arts) so know a thing or two about swords and swordfighting.

      • illi@lemm.ee
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        2 months ago

        The one I’m most familiar with is longsword, as that’s what our group trains with predominantly. I also really love one handed sword&buckler - I’m not necessarily good with it but it’s super fun.

          • illi@lemm.ee
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            2 months ago

            I assume you mean greatswords and such? Those are cool for sure, but I can see people having reservations due to safety for sparring nd such - though correct me if I’m wrong, those were not much used in duel scenarios and such - how do you generally use them, outside of solo drills?

            Also, in terms of safety - I just saw a review of a zweihander trainer by Regenyei, looked interesting. Basically an upscaled longsword feder by the looks of it - unfortunately the guy only talked about it with sword in hand, and it was a close-up so it was not very well done review, but it might interest you these exist now. I at least didn’t see any up until now.

            • Armok: God of Blood@lemmy.dbzer0.com
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              2 months ago

              I assume you mean greatswords and such?

              Anything that requires two hands to reliably use. We use the term to refer to greatswords, spears, and the like.

              correct me if I’m wrong, those were not much used in duel scenarios and such - how do you generally use them, outside of solo drills?

              The only people willing to duel with people using these weapons tend to be people that use these weapons. I was told all the reasons why not to use them before I started, with “and it will hurt a lot” given between each of the other reasons. Basically this:

  • robocall@lemmy.world
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    2 months ago

    Reggaeton, and the rise of música urbana from around 2005-2015.

    Edit I also enjoy learning about Latin American history.

  • Sasha@lemmy.blahaj.zone
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    2 months ago

    A really painful type of coordinate transformation I once had to develop to try and shed some insight on Hawking radiation near black holes.

    Unfortunately the results were fucking ugly and I gave up trying to understand them, largely due to the fact that except under very specific circumstances they’re basically impossible to calculate (you get something similar to divide by zero errors).

    Nice case:

    Not nice case:

    There was a ton more related stuff I could have spent a PhD working on, but life didn’t really allow it (and frankly I’m okay with that, I’m actually doing enjoyable stuff for the first time in my life instead of fighting my brain).

    • minyakcurry@monyet.cc
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      2 months ago

      Are you a post-doc now? If so, congrats! If you dont mind me asking, what exactly was your research about (not a physics/mathy person so ELI5 would be appreciated)

      • Sasha@lemmy.blahaj.zone
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        2 months ago

        Nah, I never even started a PhD mostly due to financial circumstances. But I’ve since realised I kinda hated academia because of untreated ADHD lol. I may go back to it one day after I’ve got treatment sorted but I really doubt it, I found my passion in music instead.

        I’ll try and ELI5 haha. Think of a black hole like a battery, stuff falls in to charge it and then it discharges by tickling empty space into creating particles. The problem is that the particles it creates seem to be random, which means it acts like a big delete button for the stuff that fell inside. Due to quantum stuff, this shouldn’t be possible, so some process could exist to encode the information about the original stuff onto the particles that leave the black hole. Importantly this doesn’t actually mean the particles that leave have to be the same as what fell in, you just need to able to look at them and then reconstruct it. Kinda like if you scrambled a book in a way which makes it look random, but is actually a secret code that still has the whole story contained inside.

        My research was to look for that information being written on the particles leaving the black hole, basically by comparing how space and time outside the black hole changes over time and seeing what it does to the tickling.

          • Sasha@lemmy.blahaj.zone
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            2 months ago

            Nah, I absolutely meant tickling. Black holes make empty space wiggle a bit and it produces particles.

            The actual process is much more complicated ofc but that’s the picture in my head of the quantum field theory, if you tickle the surface of a still pond it’ll make ripples which is sorta the same thing.

        • minyakcurry@monyet.cc
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          2 months ago

          Holy shit that’s insanely cool actually. But yea academia does get kinda ridiculous sometimes, I’m glad you found your passion for music instead!

  • Blackout@kbin.run
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    2 months ago

    I stumbled into an optics development project over a decade ago. Today I develop multiple systems a year and know the math behind it pretty well, although I use the dedicated software. I’ve also worked on the manufacturing of lenses. I’ve always been into photography and hope to start a niche camera lens company in the US just like MS optics in Japan.

  • Zos_Kia@lemmynsfw.com
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    2 months ago

    I got way too hard into the Minecraft anarchy scene so I’ve got knowledge that even Minecraft fans find abhorrent.

    Setting up bots and automation, using server exploits to hunt for hidden bases, and of course using cheat clients. I’ve even written a few hacks for a private client my group used to make.

      • Zos_Kia@lemmynsfw.com
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        2 months ago

        Yes you got it ! By combining redstone elements you can make all the basic logic gates. You combine logic gates to make binary adders, multipliers etc… You can store data as inventories, like for example a chest with 5 slots filled won’t give the same signal as a chest with 3 slots filled. And finally you have various elements that can light up when powered so you make displays out of that.

        • cheese_greater@lemmy.world
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          2 months ago

          What can you actually all do within the context of the game and its limitations?

          Like what beneficial ends can it help achieve?

          • Zos_Kia@lemmynsfw.com
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            2 months ago

            Oh, it is functionally useless in the context of the game, more of a “because they can” kind of deal… That is why you’ll almost exclusively see that kind of things in Creative mode - it eats up tons of resources for no discernible end.

    • LazaroFilm@lemmy.world
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      2 months ago

      Meanwhile I get blown up by a creeper trying to set up a fence around my cobblestone and dirt house…

      • Zos_Kia@lemmynsfw.com
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        2 months ago

        haha yeah, same when I play solo without cheats. but it’s better to have a creeper blow a hole in your dirt shack than in your carefully designed redstone contraption!

        • LazaroFilm@lemmy.world
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          2 months ago

          Cats. Cats everywhere. I started playing Minecraft a few months ago. My kid wanted to play it so I decided to try it. Now I’m hooked.

          • Zos_Kia@lemmynsfw.com
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            2 months ago

            haha yeah it ain’t a good base if it doesn’t have dozens of pets sitting around. You should show your kid how to tame parrots with seeds, he’s gonna love it !

    • neidu2@feddit.nl
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      2 months ago

      Oh yeah? Name three of their albums.

      That’s a pretty low bar, I know, but as I’m more into ProgMetal, I’m unable to name albums that are actually ProgRock. Well, except Rush.

  • LazaroFilm@lemmy.world
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    2 months ago

    I am a steadicam operator and have been making power cables for cameras. I get calls from around the USA and the world from people trying to troubleshoot their electrical systems on their Steadicam and cinema cameras.

  • Sequentialsilence@lemmy.world
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    2 months ago

    Acoustic propagation. I design large format PA systems and as a result need to know both how to make sound and stop sound at a large scale. It is entirely possible and actually relatively easy to be super precise with where sound goes or doesn’t go. The problem is cost.

    • tunetardis@lemmy.ca
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      2 months ago

      Noticed you haven’t been getting any feedback on this. That’s probably a good thing right? ;)

      • Sequentialsilence@lemmy.world
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        2 months ago

        Just message me, you’ll get some!

        So a lot of people are aware of active noise cancellation that you find in headphones nowadays, that works in large scale as well. The first time that type of technology was used was in the greatful dead’s wall of sound. The problem is it’s expensive to do large scale.