Study Asserts That Earth is Not The First Intelligent Civilization In The Universe - discu.eu

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Ten Billion civilizations could have existed so far? http://futurism.com/proof-aliens-definitely/ 4 comments 7/5/2016 aliens

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A New Empirical Constraint on the Prevalence of Technological Species in the Universe | Astrobiology http://online.liebertpub.com/doi/full/10.1089/AST.2015.1418 121 comments

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