UFO researchers are back in Las Vegas this weekend for the 7th annual UFO Crash Retrieval Conference being held at the Tuscany. Around the world, other governments have opened up their UFO files, including Britain's Ministry of Defense. But the U.S. government says it has no classified files to make public. Conference organizer Ryan Wood says the world shouldn't hold its breath waiting for the Pentagon to come clean. In the meantime, he adds, it's more important than ever for people in this much-maligned field to demonstrate skepticism where it's appropriate. [ Visit Website ]