LOS ANGELES - The Mars rovers moved toward new rocks to drill on Saturday, a day after the Spirit rover found geological evidence that the dusty Red Planet had a wet past. The Opportunity rover prepared for another drilling job as Spirit — positioned halfway around the planet — rolled slowly toward the rim of a crater called "Bonneville." The six-wheeled Spirit moved 94 feet northeast toward the crater after snapping the final photographs that scientists will use to assemble a full-circle, full-color panorama of the region dubbed "Middle Ground." Meanwhile, Opportunity used its tool-laden robotic arm to inspect a...