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Joined 1 year ago
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Cake day: February 1st, 2024

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  • In undergrad I took a class on sleep, and it really stuck with me. I previously had some FOMO-esque aversion to going to bed early, but after that class if I was done with the day and I was tired, I just went to sleep.

    It’s been a good mentality for us now that we have a small kid, too. No shame in going to bed at 8…


  • No, that’s not really a useful way of modeling it for the case of light traveling through a linear medium.

    The absorption/re-emission model implicitly localizes the photons, which is problematic — think about it in an uncertainty principle (or diffraction limit) picture: it implies that the momentum is highly uncertain, which means that the light would get absorbed but re-emitted in every direction, which doesn’t happen. So instead you can make arguments about it being a delocalized photon and being absorbed and re-emitted coherently across the material, but this isn’t really the same thing as the “ping pong balls stopping and starting again” model.

    Another problem is to ask why the light doesn’t change color in a (linear) medium — because if it’s getting absorbed and re-emitted, and is not hitting a nice absorption line, why wouldn’t it change energy by exchanging with the environment/other degrees of freedom? (The answer is it does do this — it’s called Raman scattering, but that is generally a very weak effect.)

    The absorption/emission picture does work for things like fluorescence. But Maxwell’s equations, the Schrödinger equation, QED — these are wave equations.





  • I’d like to know more.

    In all seriousness though, I thought it had some aspects of good, which was odd given that it’s satirical commentary on fascism. For instance, gender didn’t really matter and women were promoted, and while the shower scene was meant to show how fascism castrates the masses (or something like that, iirc), I thought it was a relatively wholesome scene, all things considered.


  • I could be wrong, but I think this could be due to how the states’ suit is worded? As in, I think it’s worded as, “you can’t do that in our state,” and not, “you can’t do that full stop.”

    From another site:

    Attorneys general from 18 other states also sued over the order in federal court in Massachusetts.

    Brown [AG filing the suit] noted his lawsuit is similar, but said he felt Washington should lead a separate case because of “specific and unique harms that are brought here.” He also said that “we have a very good set of judges in our bench here in Washington, so I feel like this is the right place.”

    (My emphasis.)

    So, a good first step, and while this should be struck down in its entirety, my reading is that this was a lawsuit with limited scope, and the injunction matches the limited scope.







  • IIRC chvt is a privileged command, which makes sense (if an unprivileged user could execute this command they could effectively brick the computer for a local user).

    That said, my understanding is that modern DE’s are given a lot of access, so presumably chvt is allowed (and in this case, is required because as others mentioned, password is required). So the only other option is to fail unlocked, which is all kinds of Bad.


  • No longer available I guess, but I got this: https://www.amazon.com/gp/aw/d/B0DDX1K5S1

    Only complaints are that it will thermal throttle on long workloads (e.g., transcoding or facial recognition on my entire Immich library), and the SSD slots — it comes with an mSATA drive in the first slot which is 4 lanes (I think?) and supports mSATA and NVME. The second slot is slower (1 lane?) and only supports NVME. So I had to put my nicer NVME SSD in that slot if I wanted to use the included mSATA drive, but consequently the NVME speed is slower than it should be. (I could swap it to the fast slot but then I couldn’t use the included mSATA drive.)

    For my use case, both minor issues.






  • While neat, this is not self-sustaining — it’s taking more energy to power it than you’re getting out of it. (You can build a fusion device on your garage if you’re so inclined, though obviously this is much neater than that!)

    One viewpoint is that we’ll never get clean energy from these devices, not because they won’t work, but because you get a lot of neutrons out of these devices. And what do we do with neutrons? We either bash them into lead and heat stuff up (boring and not a lot of energy), or we use them to breed fissile material, which is a lot more energetically favorable. So basically, the economically sound thing to do is to use your fusion reactor to power your relatively conventional fission reactor. Which is still way better than fossil fuels IMHO, so that’s something.