PETER JENNINGS REPORTING: UFO's: LIFE IN THE UNIVERSE - THURSDAY, FEBRUARY 24 (8:00-10:00 p.m., ET) -- Each year there are thousands of reports of unidentified flying objects, but the U.S. government doesn't investgate any of them. This special program will seriously examine the unexplained phenomena around the world that so many people believe is proof of the existence of UFOs.