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Cake day: July 6th, 2023

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  • bouh@lemmy.worldtoScience Memes@mander.xyzBees
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    2 months ago

    It makes it more dangerous : the sting is attach to the venom bag, so the venom bag gets to empty itself whole if it stays. Evolution would have chosen the survival of the hive, not the survival of the bee.

    One thing is weird though : you can extract the sting of a wasp with a pincer. The wasp will live through it. Why do the bee dies when it loses it’s sting and not the wasp?





  • bouh@lemmy.worldtoScience Memes@mander.xyzRadioactivity
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    4 months ago

    Ha ! Turns out I’m right after all : radioactivation can happen with all type of radiations. But neutron activation is the lowest energy one.

    You are right that it’s probably a contamination for the book though, and not directly an activation (although carbon can be activated and will be found in the book).


  • bouh@lemmy.worldtoScience Memes@mander.xyzRadioactivity
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    4 months ago

    I know quite a bit about radioactivity thanks to my studies. I was sure all radiations could activate something, but it turns out I was wrong apparently because I can’t find anything but neutron activation.

    I’m pretty sure alpha, beta and gamma rays can stick to a particle, often bringing it in an unstable state that will force it to release something to get into a stable state. That’s particle physics. And that’s why we call them ionising radiations : because they turn atoms into ions. But my memories are definitely fuzzy, and it was not were I was the best.

    Those radiations may only activate for a too short time to be useful maybe? I don’t know.




  • bouh@lemmy.worldtoScience Memes@mander.xyzRadioactivity
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    4 months ago

    Marie Curie studied radioactivity with pure and very active materials with no protection. The radioactivity of the notebook is indirect radioactivity, that is material that becomes radioactive after being exposed to powerful ionizing radiations. It must be noted that the notebook may not be deadly radioactive. And if it will be for 1500 years, it won’t be deadly for 1500 years. For reference, bananas tend to be radioactive too. And you are exposed to ionizing radiations when you take the plane.

    Chernobyl had two reactors burn iirc. Most of the radioactive material was in the reactor, but the fire made smoke out of radioactive materials. The quantity of smoke, in kg, that go out was significant, but it got diluted in the atmosphere and spread. Which means there wasn’t so much dust, in mass, that got in any one place. The dust is also not only uranium, but a combination of uranium and materials that were contaminated like the notebook. With the rain, the dust was washed and distributed more, and with the time, materials become less and less radioactive.

    Both the book and chernobyl are not dangerously radioactive. But because of the nature of radioactivity, care must always be taken.





  • At some point we may have to review some theories though. The idea that light would lose energy over extra long distances at least makes sense unlike some kind of latter that we can’t detect and we can’t figure out why it would either still be there but not more than it is.

    This is kind of how time was supposed to be absolute. Einstein never received a Nobel for the theory of relativity because of how suspicious it seemed at the time.




  • None of those are major breakthrough. They’re more computing power. It’s still the same technology.

    Today llm are the prime candidate for a breakthrough. They still have to prove themselves though, to prove that they’re not just a fancy expensive useless toy like the blockchain.

    Risc-v is not meant to be a breakthrough. It’s an evolution.

    Internet was a breakthrough. The invention of the mouse was a breakthrough.

    Increase in power or in disk space, new languages or os, none of those are breakthroughs. None of those changed how computer programs were made or used.

    The smartphone is a significant thing. Wi-Fi is not really important though, because you don’t do anything more with WiFi than you can do with ethernet. The smartphone though and its network, that is a big thing.


  • There is a lot of fake progress. In computer technology some things were refined, but the only true technological novelty these last 20 years was the containerization. And maybe AI. Internet was the previous jump, but it’s not really a computer technology, and it affect much, much more than that.

    And Moor law has already ended some years ago.