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Remember all those original Star Trek scenes where the earspliting noise attack would cripple the crew?
By Andrew Pollack on 11/08/2005 at 01:01 PM ESTCrippling high pitched noises forcing crew members to their knees on the bridge of the Enterprise as some kind of non-lethal submit-or-die noise came from the foe-du-jour was part for the course on the 60's TV series. 
Well, apparently the crew of that cruise ship off the coast of Africa used something like that to stop the pirate attack. According to Wikipedia, the LRAD (Long Range Acoustic Device) is commercially available. It can "fire" a sonic beam tight enough to leave the operator and bystanders unaffected while producing a high pitched sound twice as loud as a smoke alarm directly in line with where it's pointing.
Sounds a bit like something Tesla would have created, no?
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