tptacek is right. It's a cool art installation, but for practical purposes this is utterly useless. A modern hardware RNG (which is entirely silicon based) generates random bits at a vastly higher rate, and with better reliability, like built-in continuous statistical tests, than something rigged together with lava lamps, Geiger counters or the like.

I've built those kinds of science projects, and they are great for fun and for learning, but they are not practical or necessary in any production environment.