Mars Rover Happens Upon Key Water Clue
<BR><A href='http://dsc.discovery.com/news/2007/05/22/silica_spa.html?category=space&guid=20070522134500&dcitc=w19-506-ak-0008'>http://dsc.discovery.com/news/2007/05/22/silica_spa.html?category=space&guid=20070522134500&dcitc=w19-506-ak-0008</a> 
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