This is Future Tense for Monday, July 3rd. I'm Jon Gordon. New technology from NASA's Jet Propulsion Laboratory will make searching for life on mars a more practical task. Sensor Webs, as we hear in the report from Shawnee Barnes in Los Angeles, have lots of other applications. A final note...A twenty-something computer systems manager who legally changed his name to "DotComGuy" to reflect his online life is halfway to his goal. Six months ago, the 26-year-old rented a Dallas town house and said he'd live off e-commerce for a year -- and wouldn't leave the "Dotcompound." From a stark beginning, DotComGuy has acquired a workout room,