VATICAN CITY (AP) -- Pope John Paul II underwent a successful operation Thursday night to insert a tube in his throat to relieve his breathing problems, hours after he was rushed back to the hospital for the second time in a month with flu-like symptoms of fever and congestion, the Vatican said. The pope was conscious and back in his hospital room late Thursday, breathing with the help of a respirator, the Italian news agency ANSA reported. A top aide to Italian Prime Minister Silvio Berlusconi who visited the pope said John Paul was "serene" after waking up from the...