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xkcd #221: Random Number (9 Nov 2007)
(programming.dev)
A community for a webcomic of romance, sarcasm, math, and language.
Seems like the place to share. Ages ago a group epoxied a webcam and used the random flashes (from cosmic rays?) as their source of randomness.
I think what they're referring to is a company - I think it's CloudFlare - who use a bunch of physical randomness generators to seed their commercial random number generator. One of those seeds is a webcam pointed at a load of lava lamps.
https://youtu.be/1cUUfMeOijg