'Cosmos' presenter: I worry aliens have already decided we're stupid
Neil DeGrasse Tyson tells MSNBC that it's possible aliens have visited and already concluded that there is no intelligent life on Earth.
Continue Reading http://www.cnet.comNeil DeGrasse Tyson tells MSNBC that it's possible aliens have visited and already concluded that there is no intelligent life on Earth.
Continue Reading http://www.cnet.com
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