Add Yahoo as a preferred source to see more of our stories on Google. Creepy Aztec death whistle Ranging from a threatening hiss to a blood-curdling scream, the sound of the Aztec death whistle is as ...

The Aztec skull whistle produces a shrill, screaming sound. A study shows that these whistles have a disturbing effect on the human brain. The Aztecs may have deliberately used this effect in ...

During ritual ceremonies, the ancient Aztec civilization used a "death whistle" — a haunting instrument shaped like a human skull. Its eerie, high-pitched scream is not just a product of its unique ...

Its fear-splitting screech reverberates throughout space and time. Swiss and Norwegian neuroscientists have discovered that the ancient Aztec death whistle — often credited with emitting the scariest ...