TIL CLoudFlare has been using lava lamps, double pendulums, and Geiger counters as an alternative source of randomness for encryption keys since at least 2017

https://en.wikipedia.org/wiki/Cloudflare#History

https://www.reddit.com/r/todayilearned/comments/15kl2f0/til_cloudflare_has_been_using_lava_lamps_double/