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Cake day: June 10th, 2025

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  • You can shape them that no matter how the light falls on it, it will align to the center. Kind of like how satellite dishes work but in reverse.

    how do you do this, actually? I’m curious about the details because I just watched a video on compound parabolic reflectors, haha

    a regular (ideal) convex lens with a single focal point will have the image move around as the light source moves across the sky. AFAIK satellite dishes tend to be paraboloids, which focus parallel rays onto the focal point, and if you change the angle of the light source, you’ll start losing focus. Stuff like the DSN and radio telescopes absolutely do have to aim and track their targets (or are forced to follow the rotation of the earth).

    satellite dishes that are aimed towards geostationary satellites don’t have to move (because their targets are stationary in the sky), while stuff like starlink tracks targets with a phased array.




  • Ernest@lemmy.ziptomemes@lemmy.worldThe horrors
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    11 days ago

    just wanted to add another answer to the wonderful ones you’ve gotten already.

    During the darkest days of the AIDS crisis, we buried our friends in the morning, we protested in the afternoon, and we danced all night, and it was the dance that kept us in the fight because it was the dance we were fighting for.

    I don’t really have a good answer on how to find joy despite the bleak violence of reality, but I know that we must still try to find it, because hope and joy is exactly that which they are trying to snuff out.









  • Ernest@lemmy.ziptomemes@lemmy.worldTake a hint
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    1 month ago

    I think there are plenty of channels that aren’t just using “cheap stock photos and/or blender animations”, and I can list some examples if you’d like. The first criterion is harder, though, because sci-com by its very nature isn’t going to be original research, so channels in this category tend to be more creative or opinion-based (i.e. multi-hour video essays).

    That said, if I’m trying to really get at the gist of what you’re saying, I think you’re looking for shows that have a lot of original work and high production value?

    Some random examples I can think of (I’m sure there’s plenty more):

    • 3 Blue 1 Brown
    • Captain Disillusion
    • Gamers Nexus (specifically their investigations)
    • Smarter Every Day
    • Every Frame a Painting (inactive but with a huge catalogue)
    • PBS Eons
    • Technology Connections
    • Montemayor
    • Taylor Lorenz
    • Climate Town
    • Tantacrul

    (this is excluding so many great video essayists and artists since the original comment seems not to be referring to those)