By definition it is impossible to compute random numbers. This should just make good intuitive sense. Personally I don't believe that random numbers even exist. I read a really interesting physics book (I forget the name sadly) that proposed that quantum mechanics isn't random; what is random is our ability to measure quantum events. In the mean time you will obviously do better trying to use large, highly-chaotic systems like the weather or whatnot to produce pseudorandom numbers. IIRC lava lamps are actually good for this
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