Cuban revolutionary leader Fidel Castro delivered a valedictory speech Tuesday to the Communist Party that he put in power a half-century ago, telling party members he will soon die and exhorting them to help his ideas survive. 'I'll be 90 years old soon,' Castro said in his most extensive public appearance in years, adding: 'Soon I'll be like all the others.' He went on: 'The time will come for all of us, but the ideas of the Cuban Communists will remain as proof on this planet that if they are worked at with fervor and dignity, they can produce the...