HAVANA - There was no sign of a convalescing Fidel Castro as hundreds of thousands of Cubans marched through Havana's Revolution Plaza to celebrate May Day, casting new doubts on his recovery and whether he will return to power. Tuesday marked only the third time in nearly five decades that Castro has missed the sweeping International Workers' Day festivities — a major celebration here and around the world. While recent images of Castro meeting with Chinese leaders indicated he had improved considerably since undergoing emergency surgery nine months ago, his absence at the parade through the Revolution Plaza raised questions...
