The U.N. refugee agency on Thursday chose as a goodwill ambassador a Syrian teenage girl who helped save a boat carrying fellow refugees and later became an Olympic swimmer. Yusra Mardini joined other notables like actress Cate Blanchett and author Khaled Hosseini in the unpaid advocacy role. UNHCR chief Filippo Grandi said Mardini "represents the hopes, the fears and the incredible potential of the more than 10 million young refugees around the globe."