There's plenty happening right in this world -- Iraqi bombings, Afghan troubles, Mexican summits, Iowa caucuses -- but far from here, up in the sky, mystery beckons. A piece of us has landed on Mars and is sending back mesmerizing postcards. Imagine that: wish you were here messages from the Red Planet. Despite little time and too much work, I find myself gazing up, up, up, away from my desk, away from my computer monitor, elated by curiosity. Since NASA's Spirit rover touched down on a brick-red crater, the evening news has been filled with the details of its attempted...