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Built over a seething volcano

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Built over a seething volcano.jpg Ever-shortening tetherThumbnailsLet the mathematics professor demonstrate the lesson for usEver-shortening tetherThumbnailsLet the mathematics professor demonstrate the lesson for usEver-shortening tetherThumbnailsLet the mathematics professor demonstrate the lesson for usEver-shortening tetherThumbnailsLet the mathematics professor demonstrate the lesson for usEver-shortening tetherThumbnailsLet the mathematics professor demonstrate the lesson for usEver-shortening tetherThumbnailsLet the mathematics professor demonstrate the lesson for us