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Cake day: June 20th, 2023

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  • Disclaimer: I could be wrong or not up to date, but this is my current understanding.

    On the small scale, forces like electromagnetism and gravity pull things together much much faster than the rate of cosmological expansion. That’s why “we” don’t expand, and neither does our frame of reference. There’s a potential end to the universe where the rate of cosmological expansion (which increases over time) finally exceeds gravity and electromagnetism and eventually even the strong force, causing everything to fly apart forever.

    Light waves propagate through spacetime itself, and basically it ends up being that there’s nothing pulling it back from expanding as the space it travels expands.













  • Look up how HLS (HTTP Live Streaming) works. They just need to generate a personalized playlist for each person which points at things already hosted on CDN, and insert the ads where they want in the literal text file that your video player reads from to serve you the video.

    I don’t know much about it, but it looks like there’s specific tags designed for dynamic ad insertion. Idk if YouTube plans to use them in this case though, if they want it to be undetectable to the client.