Seeking a Pot of Geological Gold by Aaron L. Gronstal Astrobiology, December 15, 2011 http://astrobio.net/index.php?option=com_expedition&task=detail&id=4400&type=story http://www.spacedaily.com/reports/Seeking_a_Pot_of_Geological_Gold_999.html PDF file at http://astrobio.net//makepdf.php?id=4400&component=news Yours, Paul H.