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The Fermi Paradox: Where Are All the Aliens?

Have you ever looked up at a night sky filled with stars and wondered if there is other intelligent life out there? If there is other intelligent life out there, where is it and why haven't we seen any aliens? This video seeks to explain the Fermi Paradox, which is the apparent contradiction between the high estimates for the probability of the existence of intelligent aliens and the lack of evidence for such life.

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AAAS