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Dr. John Grant, Geologist for Earth and Planetary Studies, NASA

NASA is celebrating the two year anniversary of the Curiosity Rover’s landing on Mars. The robot has used its six wheels to tour the red planet, searching for signs that something once lived there. John Grant is a geologist for Earth and Planetary Studies at NASA. He joined Tom Temin and Emily Kopp on the Federal Drive to recap what the rover has accomplished in the past two years.