During World War II, natives on some Pacific islands saw something most unusual. Strange men appeared, cleared long strips of land and built structures decorated with flags. Some of these men wore large cups over their ears, while others waved sticks and, almost magically, machines appeared from the sky carrying valuable cargo.After the war ended, the men left and the supplies stopped coming. Some of the natives formed cargo cults which copied many of the the rituals the soldiers performed. They marched in formation, wore cups over their ears and waved sticks around. Alas, no airplanes ever came.