Ray Arvidson, chair of the Department of Earth and Planetary Sciences at Washington University, has been in the news a lot lately. He's spending his sabbatical serving as deputy principal investigator of the Mars Rover mission. As two high-tech dune buggies, Spirit and Opportunity, roam opposite sides of Mars, Arvidson and his team (which includes a number of Wash. U. grad students) help man the controls and... More >>>