Flying saucers and strange beings who have visited Earth aren't the typical topics reported by Peter Jennings, anchor of ABC's "World News Tonight." Jennings, whose new two-hour special tackles the subject of UFOs, admits he and his production team began the project with doubts and a dose of curiosity. "We have a lot of skeptics -- I am very skeptical -- but we seriously investigated something a lot of people are serious about," he said. "And when we come to the end, this is wonderfully interesting. "More than 80 million Americans believe intelligent beings from somewhere else have come here,"...