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EXISTENCE By David Brin Tor Books ISBNBillions of planets may be ripe for life, even intelligence. So where is everybody? Do civilizations make the same fatal mistakes, over and over? Might we be the fir
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Document Date: 2012-10-31 10:52:47
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EXISTENCE By David Brin Tor Books ISBNBillions of planets may be ripe for life, even intelligence. So where is everybody? Do civilizations make the same fatal mistakes, over and over? Might we be the fir