Five young Americans spent two months traveling across the United States recently on a two­month bus journey.But this was not a romantic cross­country trip of self­discovery.These five youths were on a mission to raise money to combat AIDS in Africa.The driver of a yellow school bus revs its engine.A black­and­white mural painted on the bus's side shows children's faces, the phrase “Close the Gap”£¬ and a large number “three”£®