ZÜRICH, Switzerland — Imagine an object so terrifying that its mere sound could make your blood run cold — a sonic weapon designed to disrupt the brain and induce pure dread. This isn’t the plot of ...

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 ...

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 ...