People use random.org for a myriad of things, including holding drawings, lotteries and sweepstakes, to drive online games, for scientific applications, and for art and music. This page explains why it's hard (and interesting) to get a computer to generate proper random numbers. This page describes the statistical analyses that have been conducted of the true random number service random.org
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Random.org is a true random number service that generates randomness via atmospheric noise