ChatterBank1 min ago
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No best answer has yet been selected by GrahamT. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.Apparently it is something to do with the frequency of the noise and the fact that it isn't a 'pure tone' that makes people react that way. This link explains it a bit:
http://www.madsci.org/posts/archives/aug98/902328462.Bp.r.html