Thirteen teams from the United States, Korea and Germany will be in Tucson April 9-11 to compete for $6,000 in prize money during the 8th International Micro Air Vehicle (MAV) Competition. MAVs are tiny, radio-controlled airplanes — less than six inches in diameter — that carry video cameras. They're designed for reconnaissance missions and can be used for search-and-rescue, law enforcement, military surveillance, or in any situation (such as a nuclear power plant breakdown) where sending in a human observer might be dangerous. MAVs are silent beyond 50 or 60 feet and their small size makes them difficult to bring...