Back about 25 years ago I wanted to build a PC card to generate better random numbers. The idea I had at the time was to build in a set of four or five FM/AM radio receivers into this card and have them hop ratio stations constantly at, well, random intervals. Then I'd use the digitized audio signals in some combination to feed a random number generator. I thought it was a good idea at the time. Well, I didn't have enough experience yet to know just how much I didn't know. Never built it.