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Joel Levine: Why we need to go back to Mars


Joel Levine: Why we need to go back to Mars
Joel Levine: Why we need to go back to Mars
Duration: 16:14

At TEDxNASA, planetary scientist Joel Levine shows some intriguing -- and puzzling -- new discoveries about Mars: craters full of ice, traces of ancient oceans, and compelling hints at the presence, sometime in the past, of life. He makes the case for going back to Mars to find out more.