The first use of the tools on the arm of NASA's Mars Exploration Rover Spirit reveals puzzles about the soil it examined and raises anticipation about what the tool will find during its studies of a martian rock. Today and overnight tonight, Spirit is using its microscope and two up-close spectrometers on a football-sized rock called Adirondack, said Jennifer Trosper, mission manager at NASA's Jet Propulsion Laboratory, Pasadena, Calif. "We're really happy with the way the spacecraft continues to work for us," Trosper said. The large amount of data -- nearly 100 megabits -- transmitted from Spirit in a single...