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Cake day: June 30th, 2023

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  • Sound is just patterns of air pressure.

    If you were able to go “puh puh puh” in someone’s ear 440 times per second, they’d hear a middle A note if they didn’t punch you first.

    Imagine a delicate needle in front of your mouth. If you “puh” at it, it wiggles. If you play an A on a violin, the violin string wiggles 440 times per second. That vibrates the air around the string at the same speed. That air vibrates your ear drum 440 times per second, so you hear it. But it also vibrates the needle. Now let that needle carve a pattern in a spinning disc. That pattern of pressure is now recorded. If you harden that disc and balance a needle over it and spin it again at the same speed, the needle will vibrate 440 times per second. You can use that to make a big floppy piece of paper vibrate 440 times per second. That vibrates the air, which vibrates your ear drum just like the original violin string would’ve.








  • The black holes evaporate eventually.

    After that, depends on who you ask. Most physicists would say something like “as close to nothing as possible”. Penrose would say at a certain point when nothing can interact with anything else, distance loses meaning, which makes the universe and a singularity equivalent, so then things restart.




  • humorlessrepost@lemmy.worldtoScience Memes@mander.xyztwo sides
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    2 months ago

    Same with Pythagoras.

    He banned beans because he thought they contained souls, demanded his followers endure years of silence, and claimed to remember his past lives (including being a Trojan hero and a fish). His secretive brotherhood treated numbers like divine beings, and he supposedly lost his mind over the idea that the planets hum cosmic harmonies. He was a math genius, but also one philosophical fever dream away from starting a numerology space religion.