This American Life host Ira Glass and producer Susan Burton spent a week in August recording a suburban Chicago youth group at every stage of their very first mission trip. The teenagers were from Covenant Presbyterian Church in Chicago. They went to West Virginia, to fix up someone's house, and to witness about their faith to strangers. The goal: That they mature from a child's kind of faith to an adult's. There's a boom in mission trips like this right now, a boom that crosses denominations.