These Are the Words Most Commonly Used to Describe UFO Sightings
The National UFO Reporting Center (NUFORC) has identified the most common words used to describe UFOs.
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These Are the Leading Theories about D.B. Cooper and 30 Other Unsolved Mysteries
Here are 31 of the most enduring and perplexing unsolved mysteries, from grisly murders and ghost ships to great escapes and entire colonies of people disappearing without a trace.