What Mystery Would You Most Like to See Solved?

And for me it is the death of Natalie Wood in 1981. I never believed the story that she stepped out into a dingy drunk, fell in the water and drowned because it is widely known she was scared to death of drowning and never went near the ship's edge. Now some new information is coming to light.

What about you? What mystery, death, puzzle most fascinates you?