http://www.theregister.com/2005/12/02/mosquito/

Can you imagine it? Clear out the line at the music store, enjoy a museum
in DC during the Summer, this is the perfect tool.

"Howard Stapleton's "Mosquito" emits an ultrasonic sound which can be heard
by most kids and teenagers but is inaudible to the majority of adults over
30 due to the inevitable deterioration of hearing with age."


--
Frank Reid
Euthanize to respond