Mars' 600-Million-Year Drought -- Did It Drive Life Underground?

ALLPLANETS-HOLLOW Yahoo Group (Old Posts)
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Wow, an admission that life might still be underground on Mars! http://www.dailygalaxy.com/my_weblog/2012/02/mars-600-million-year-drought-did-it-drive-life-underground.html#.TzAEPoh7eUg.twitter