posted on May, 9 2013 @ 06:56 AM
I hadn't realized that this was a global phenomenon at first, but after reading this thread, I'm no longer surprised. I know I'm coming into this
discussion awfully late, but I just wanted to add a story that I heard as a freshman in college a number of years ago...
It seems that a few of the undergraduate students in the engineering department wanted to try an experiment over a holiday weekend. They calculated
the resonant frequency of the fire exit stairwell in a 12-story dormitory and placed a speaker on the bottom floor under the stairs that played the
tone continuously. According to the story, when everyone came back from holiday, the dormitory building was visibly swaying slightly, and the
facilities maintenance staff removed the speaker to prevent the building from shearing off at the sixth floor.
Whether that was true or not, I'll never really know. But it was definitely my first exposure to the power of sound on solid objects.