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"Finding life on distant exoplanets may be more difficult than scientists thought, researchers from China, the United States and Argentina said Monday."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.upi.com/Science_News/2013/10/08/Search-for-alien-life-more-complicated-than-thought-scientists-say/UPI-56991381270238/>