By Sarah MakuchIt's a bird! It's a plane! No it's... a UFO?
It's not as unlikely as you might think. UFO investigators and organizations have collected hundreds of thousands of eyewitness accounts over the past 57 years alone. And the eyewitnesses are far from being drunken woodsmen - airline pilots, military men and even a U.S. President have reported seeing a UFO.
The most famous UFO sightings are...
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