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Apr 23, 2014 09:00 AM ET // Jennifer Viegas
A mysterious duck-like sound in the ocean is finally identified -- but other puzzling noises remain unsolved.
Mar 23, 2012 02:59 AM ET // Benjamin Radford
Authorities have been unable to locate or stop the strange loud booms heard in Clintonville, Wis.
Feb 8, 2012 04:20 PM ET // Benjamin Radford
Mysterious sounds heard and recorded around the world have fueled conspiracy theories.