EXISTENCE By David Brin Tor Books ISBNBillions of planets may be ripe for life, even intelligence. So where is everybody? Do all civilizations

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Date: 2012-07-22 17:47:56 David Brin Transhumanists Literature Scientific controversies Startide Rising The Postman Earth Extraterrestrial life Sergey Brin Science fiction SETI Astrobiology		EXISTENCE By David Brin Tor Books ISBNBillions of planets may be ripe for life, even intelligence. So where is everybody? Do all civilizations Add to Reading List Source URL: davidbrin.com Download Document from Source Website File Size: 63,15 KB Share Document on Facebook

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