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Most scientists assume that the universe must be populated with innumerable alien intelligences and civilizations-after all, there are billions of galaxies each with billions of stars and planets-we humans can't be so special. The universe should be teeming with life. OK, that's the argument. So where are they? How come there's zero evidence?
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Nick Bostrom is a Swedish philosopher at St. Cross College, University of Oxford known for his work on existential risk and the anthropic principle. He holds a PhD from the London School of Economics (2000).
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