scott wrote:
> suspect it's somewhere around 20 Hz, 

Closer to 10Hz.  Between 10Hz and 20Hz, you detect sufficiently loud sound 
with different organs, such as your eyeballs vibrating or your sinuses 
resonating. If you play a tone in that range, you get the "spooky" feeling, 
or unaccountably sad, or mystical feelings, or things like that, depending 
on the frequency.

-- 
Darren New, San Diego CA, USA (PST)
   Linux: Now bringing the quality and usability of
   open source desktop apps to your personal electronics.

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