You know the slick "Whoosh" you hear from spacecraft zooming through the cosmos in Hollywood Sci-Fi movies? Yeah, that just isn't happening. Trace explains what happens to sound in the vacuum of space.
A mysterious duck-like sound in the ocean is finally identified -- but other puzzling noises remain unsolved.
Authorities have been unable to locate or stop the strange loud booms heard in Clintonville, Wis.
Mysterious sounds heard and recorded around the world have fueled conspiracy theories.