Ahh yes, interesting. I think it's quite possible that houses in industrial areas would have a higher chance of such a phenomenon, factories emit all sorts of strange sounds (anyone ever hear of the 7hz chicken head story? :P). Of course, the infrasound was demonstrated with a 7 meter pipe, there are all sorts of pipes in houses, plumbing etc, sewers underneath which could all be triggered by vibrations.
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I'm most definately not 'lovin' it'.
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