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Three Life-On-Mars scenarios, as described by NASA Curiosity Scientist Ashwin Vasavada

Is there (or was there ever) life on Mars? In this great little video — produced by the folks over at thinkrtv — Dr. Ashwin Vasvada, NASA's Deputy Project Scientist for the Mars Curiosity mission, presents three theories surrounding life on the Red Planet, and describes how rovers like Curiosity are helping us paint…