Astronauts begin the mission's final spacewalk

Astronauts Mike Fossum and Ron Garan are taking a third and final spacewalk today, an excursion highlighted by a dramatic robot arm ride over the top of the space station to replace a nitrogen tank. Dubbed the "windshield wiper maneuver," the ride from one side of the station to the other will put Garan "clearly on top of the world," said...

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