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Curiosity Hits Paydirt: New Clues To Life On Mars

Mar 15, 2013 (Talk of the Nation) — Microbes may once have happily existed on the surface of Mars, according to chemical analysis of a sedimentary rock in the Red Planet's Gale crater. NASA geologist and exobiologist David Blake discusses evidence for an ancient freshwater lake in the crater, and describes the mineral-chomping microbes that may have thrived there.

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