Lieutenant Commander Alex Dietrich is, by her own admission, a highly rational person.
A US Navy fighter pilot who served combat tours in Iraq and Afghanistan, she has landed a supersonic F/A-18 jet on an aircraft carrier hundreds of times, and now teaches at the US Naval Academy.
She has also had one of the most famous close encounters with a UFO, or Unidentified Flying Object.
On November 14, 2004, Lt Cdr Dietrich was stationed off the coast of southern California on the USS Nimitz carrier, when numerous flying objects were picked up by ship radar - see the final silent clip in the video below.
The objects had descended impossibly fast, dropping a distance of 80,000ft in less than a second.
To read more, click here.