Explanation for ghosts?

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Phobos
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http://www.cnn.com/2003/TECH/science/09/08/ghosts.sounds.reut/index.html [Broken]

...weird sensations and shivers down the spine may not be due to the presence of ghosts in haunted houses but to very low frequency sound that is inaudible to humans.
 
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Ivan Seeking
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perhaps the only real ghosts are those that live only in hilbert space (ie in abstract thought).

cheers,
phoenix
 

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