<http://schema.org/alternativeHeadline>
"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."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/space/videos/wisconsin-scientists-help-search-for-alien-life>