University of Wisconsin-Madison scientists are helping search for alien life forms, but they will never go into space. They are studying Earth rocks that are billions of years old, looking for ... more 
University of Wisconsin-Madison scientists are helping search for alien life forms, but they will never go into space. They are studying Earth rocks that are billions of years old, looking for information. (Feb. 13) less 
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Wed, Feb 13, 2013 3:20 AM EST