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Carl Sagan - Cosmos - Drake Equation
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Carl Sagan shows how the 'Drake Equation' is used to estimate the number of advanced civilizations in our Galaxy.

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The Drake equation is a probabilistic argument used to estimate the number of active, communicative extraterrestrial civilizations in the Milky Way galaxy.   From "Cosmos" - Episode 12 - "The Encyclopaedia Galactica"
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