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Joined 2 years ago
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Cake day: August 3rd, 2023

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  • Gravity isn’t a force, strictly speaking. Objects move along geodesics in spacetime (that’s basically a straight line along a curved surface), and gravity bends spacetime, and therefore also these geodesics, around massive objects. So you don’t actually get accelerated by gravity, that’s why you don’t feel anything during free fall. What we perceive as the force of gravity pushing us down, is the solid ground accelerating us upwards, when following the geodesic would have us fall instead.

    So when the sun disappears, the geodesic that used to spiral around the sun suddenly straightens out, and the neutral movement, the new free fall, has the earth continuing in a straight line. You wouldn’t be able to feel that. What the other person said about tidal forces is true tho, it would likely cause worldwide tsunamis





  • Matrix is a federated system, kinda like Lemmy. If you just use an existing instance that you trust, it’s basically just another e2ee messenger. But many people host their own, and for that you need to a) have access to a server or VPS and b) have that server secured, i.e. configure firewalls, certificates, etc. It’s not super hard, but takes some technical knowledge. Your non-technical friends can just use your instance, tho.

    The benefit is that you control your data, not some external provider. From a pure security standpoint, however, there’s not a lot of benefit over, say, Signal.

    Of course, that’s the infrastructure aspect of security. Other things, like having strong and varied passwords, no biometric logins (or only with 2fa), not sharing personal information about yourself or friends online, those obviously everyone needs to follow.



  • In terms of increasing paranoia, but also obscurity:

    Signal (easy, pretty secure messenger replacement)

    Matrix (self-hosted, which means you control the data, but it requires good security practices on your end to be safe)

    SimpleX (messenger without user IDs, makes it nigh impossible to trace who’s communicating with whom)

    Briar (peer to peer messenger over Tor, Bluetooth, local WiFi, or physical drives)








  • It didn’t suck exactly, time is just so much more prevalent than other units that switching to a new system was even more contentious. Current time is just as arbitrary (although maximizing for maximum number of prime factors is pretty nice, even if it doesn’t mesh nicely with other metric units)