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Aliens exist.
When discussing this topic please take:
The Drake Equation http://en.wikipedia.org/wiki/Drake_equation and
The Fermi Paradox http://en.wikipedia.org/wiki/Fermi_paradox into account.
Also you should check Birdia Tak Wai Chan's conversation on the same topic http://www.ted.com/conversations/1660/aliens_exist_1.html
Aliens exist?
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Bran Corvus