Mars Up Close, Part 2: John Grant

Mars is a rock lover's paradise and NASA geologist John Grant is searching for clues in the rocks for telltale signs of life in the red planet's past.

The National Geographic Live series brings thought-provoking presentations by today’s leading explorers, scientists, photographers, and performing artists right to you. Each presentation is filmed in front of a live audience at National Geographic headquarters in Washington, D.C. New clips air every Monday.

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