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Defend Earth
Andrew Knoll
Harvard biologist and science team member, Mars Exploration Rover mission
Latest Planetary Radio Appearances
Life on Mars...and Earth
We visit Harvard biologist Andrew Knoll for a conversation about finding life on the red planet. Emily Lakdawalla is seeing red on another of Earth's neighbors, and Bruce Betts spins a tale of Death Stars, cockroaches and trivia contests on What's Up!