Apollo 14 astronaut Edgar D. Mitchell, the sixth man ever to walk on the moon, has a message for all citizens of Earth: We are not alone. "We are being visited," the 79-year-old grandfatherly "spacefarer" told 100 or so UFOlogists gathered at a National Press Club conference called by the Paradigm Research Group (motto: "It's not about lights in the sky; it's about lies on the ground"). "It is now time to put away this embargo of truth about the alien presence," said the astronaut who made the longest moonwalk in history. "I call upon our government to open up...