o donnell: well, there s medical history tonight at the university of maryland. a 57-year-old patient there is the first human to have the heart of a jean-edit pig beating inside his chest. it was a risky nine-hour surgery. doctors implanted the heart from a one-year-old pig genetically engineered and bred specifically for this purpose, saving human lives. what an advance. tonight, several los angeles police officers are being called heroes after racing to rescue the pilot of a small plane who made an emergency landing on train tracks seconds after the pilot was pulled out, a commuter hed to thehed into is it plane. the u.s. min s rst of fivne u.s. quarters comints yer. first up is poet, writer and civil rights icon maya angelou.