What in the world do lava lamps have to do with internet security? It has to do with random numbers. Machines aren't good at generating random numbers, but flowing liquid is about as random as you get. An entire wall of lava lamps moving colored liquid around is is unpredictable enough to generate random numbers. Learn how it's done from Tom Scott, who is still in California finding us interesting things to learn about. This is from Cloudflare in San Francisco.