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Excellent story. As a caver, I would submit that caves are one place that we have left that have a very long interval of silence. This is one of the reasons that we (cavers) so enjoy visiting such places. In a cave, one can experience silence so intense that it becomes audible and it presses in on one's ears. Visitors who are unaccustomed to such silence tend to giggle nervously in the silence. In addition to being silent places, caves are one place where we can escape from light pollution by experiencing total darkness. I would be interested to hear Gordon's comments and experiences about caves.