Mars Exploration Rover Project Manager, NASA Jet Propulsion Laboratory
Spirit is stuck in the sands of Mars. Opportunity is racing toward Endeavour Crater. Their boss, John Callas, reports on both rovers that have made the red planet their home for more than five years. Bill Nye debates the future of humans on the Moon. Bruce Betts looks to the Perseid meteor shower in his What's Up review of the night sky as he and Mat Kaplan offer a special prize for the new space trivia contest.