Because if you answer "advanced aircraft research", the lunatic fringe tunes you out. Any answer except "crashed saucers and them thar aily-yuns" will be ignored.
This lapse of logic is unfortunately common. No point reinvestigating 9/11, because any answer other than "George Bush done it with holograms, mini-nukes, and Death Rays from Space, and therm*te too!" will be ignored. No point taking another look at the Kennedy assassination either- any answer that involves Oswald, and no one in the sewer or grassy knoll, will be ignored.
No sense spending money to try and convince the lunatic fringe of anything. They don't even understand that we went to the Moon, and won't listen when their mistakes are corrected.
Unsolved History - 2002 Area 51 3-5 was released on: USA: 17 February 2005
that is the greatest unsolved mystery of them all.
An unsolved mystery...
That really all depends on the person and the unsolved mystery.
An unsolved mystery...
ddhdhdh
Enigma : the unsolved Mystery
Unsolved Mysteries - 1987 Insecurity Guard 12-51 was released on: USA: 16 October 2001
its mystery creek
America's Most Unsolved Mystery The Masked Man - 2012 was released on: USA: 2 August 2012
Unsolved History - 2002 The Iceman Mystery 1-7 was released on: USA: 20 November 2002
Their mythological stories and beliefs.