Pope Leo pledged on Sunday to slowly resume his usual activities as the leader of the world's 1.4 billion Catholics as he greeted crowds in St. Peter's Square during his first public event since undergoing surgery for lung cancer five days ago.The 71-year-old pontiff had an operation on Tuesday to remove the lower lobe of his right lung, fuelling speculation about how his illness might change his 17-month papacy.Smiling from a window of the Vatican's Apostolic Palace as he spoke to pilgrims b...
