The teacher who lost four students. The mother whose son died, while another clings to life. The photographer who survived but is haunted by guilt.As the southern Brazilian city of Santa Maria began to buzz again Tuesday with cars and people, a somber mood still ruled the streets, where a nightclub fire Sunday claimed 235 lives.The teacher who lost four students. The mother whose son died, while another clings to life. The photographer who survived but is haunted by guilt.As the southern Brazilian city of Santa Maria began to buzz again Tuesday with cars and people, a somber mood still ruled the streets, where a nightclub fire Sunday claimed 235 lives.