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- Drake equation: How many alien civilizations exist? (interactive chart) http://www.bbc.com/future/story/20120821-how-many-alien-worlds-exist 2 comments
- BBC - Future - Drake equation: How many alien civilizations exist? http://www.bbc.com/future/story/20120821-how-many-alien-worlds-exist 13 comments space
- Help me give a statistical answer to the question of how likely it is that our civilization is the only one in existence. http://www.bbc.com/future/story/20120821-how-many-alien-worlds-exist 36 comments math
- How many alien civilizations exist ? http://www.bbc.com/future/story/20120821-how-many-alien-worlds-exist 10 comments space
- Drake equation: How many alien civilizations exist? http://www.bbc.com/future/story/20120821-how-many-alien-worlds-exist 112 comments space
- How many alien civilizations exist? Calculate the number of alien civilization in 3 easy steps. http://www.bbc.com/future/story/20120821-how-many-alien-worlds-exist 6 comments science
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