Swiss and Norwegian neuroscientists have discovered that the ancient Aztec death whistle — often credited with emitting the scariest sound on earth — still terrifies people today due to a primal fear ...

Aztec death whistles don't fit into any existing Western classification for wind instruments; they seem to be a unique kind of "air spring" whistle, based on CT scans of some of the artifacts.

Researchers find key to Aztec symbol code System stymied scientists for centuries by BY ALAN ZAREMBO LOS ANGELES TIMES | April 6, 2008 at 4:02 a.m.