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Did you know that the microphone was invented in order to help improve the sound quality of the telephone? Or that the first records were made of glass? There is more interesting audio information here : http://inventors.about.com/od/mstartinventions/a/microphone.htm I find it very fascinating and educational.
This is very fascinating indeed and to imagine that this dates back to 1876 is even more intriguing. That's quite a good read.