Cloudflare uses lava lamp as a source of randomness
https://www.cloudflare.com/learning/ssl/lava-lamp-encryption/
since the motion of fluids is notoriously hard to compute, this makes for a good source of randomness.
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Thirty years ago, lavarand.sgi.com did the same thing.
https://en.wikipedia.org/wiki/Lavarand
Relevant Tom Scott video
I believe that LetsEncrypt also has a lava wall
I decoded it from LL to binary so you don't have to. Who can translate the encryption key to English? 0000101010100001111 0101110101010101010 1010102010201010101 010101.5010101010101