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"NASA's Spirit rover landed on Mars on January 3rd, 2004, with Opportunity joining up 21 days later, and both are going strong five years later. Still no sign of Don Cheadle."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2009/01/03/mars-rovers-mark-off-five-years-of-tireless-servitude-to-humanit/>