From: here@is.invalid   
      
   Rattlesnake Rattles Use Acoustic Trick To Fool Human Ears   
      
   Rattlesnakes increase their rattling rate as potential threats   
   approach, and this abrupt switch to a high-frequency mode makes   
   listeners, including humans, think they+IBk-re closer than they actually   
   are, researchers report August 19th in the journal Current Biology.   
      
      
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)