Since the 1960s, scientists have been bemused and bewildered by what sounded like a deep resonant quacking sound in the southern ocean.
As it turns, the Yeti really is a rare creature. It just isn't exactly what we thought.
This is the Voynich Manuscript. You can't read it, and neither can anyone else, but it definitely contains some secrets.
Rocks that somehow race around the Southern California desert have been making fools out of scientists for decades, but the mystery may now be solved.
In 1997, the U.S. NOAA's Equatorial Pacific Ocean autonomous hydrophone array detected a "bloop" sound. The "bloop" was consistent with the sounds of an animal, but it was far too loud. It could have been aliens. Or a sea monster. Or aliens. But it's not.