Jeffrey Lee and Gerald Cleaver at Baylor University in Waco TX suggest that people use the thermal radiation left over from the big bang--the cosmic microwave background (CMB). There are several ways to extract numbers from the CMB. For example, one could divide a patch of sky into pixels and measure the strength of the CMB's radio signal, which is never duplicated exactly. Overtime, each pixel would generate a string of different strengths, which are just numbers. Putting the strings together gets one a very large random number. "An adversary measuring the same patch of sky exactly the same way and at exactly the same time could not get exactly the same values," says Lee
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