Biting opponents, racist comments - all that looked to be behind Luis Suarez, as soccer's bad boy was maturing into a star for his club and country. Then, the old habit that most people leave behind in nursery school cropped up again in front of an audience of millions. Faced with a smothering and frustrating Italian defense in a must-win World Cup game Tuesday, the Uruguayan superstar responded with his front teeth. It came at about the 80th minute when Suarez and Italy defender Giorgio Chiellini got tangled up in front of the Italy goal. The apparent chomp happened in an instant,...