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UFO's are seen everyday by all kinds of people and the majority of the sightings can be easily explained away. (We are pretty sure we sparked panic of a mass invasion when we reviewed our own UFO in 2005.) There are, however, a small percentage of UFO sightings that are never explained. HowStuffWorks has put together a very nice write up on how UFO's work that briefly covers all aspects of UFO encounters from MIB's to alien abductions. For those looking for more information Richard M. Dolan has written a history of UFO's from 1941 to 1973 and is currently working on the second volume of his work. Read with an open mind, and decide for yourselves if UFO's exist or if educated professionals and pilots have been just seeing "swamp gas" for the past 50 years.

How UFO's Work | HowStuffWorks

UFOs and the National Security State: Chronology of a Coverup, 1941-1973