Hi Richard, You write: >Once had a friend say he could hear music from the fillings in his teeth. > Always got a laugh. We tried an experiment . He sat in another room while > we had an AM radio playing popular music. He couldn't hear the radio > from his location but he could tell us what melody was playing.
Indeed. It is a little know fact that bone is a semiconductor, it is also piezoelectric which is why electric stimulation can be _very_ effective in causing bone fractures to heal. But whenever you have a conductor ( the filling ) and a semiconductor ( the tooth ) in contact you have the makings of a diode, which will in fact demodulate the AM signals quite handily. You will note that it is specifically AM radio, and not FM, that is mentioned in connection with this phenomena. This is why. K.
