Mars lander's digger is burrowing again after snag

A Mars lander's digger is burrowing into the red planet again after hitting a snag seven months ago.NASA said Thursday the mechanical mole has penetrated three-quarters of an inch (2 centimeters) over the past week."We're rooting for our mole to keep going," said the experiment's lead scientist, Tilman Spohn of the German Aerospace Center, in a statement.