So happens that when I was living on Long Island in the late 1970s there was an item in the local papers. A man called the police, saying he was hearing music in his head. A policeman came to his house, and listened to the man's head. The policeman heard music. They both listened to the man's head for a while, and learned that it was a radio station in nearby Connecticut. The following day a dentist replaced the filling that was receiving the signal, and the music stopped. When asked, dentists tend to deny the existence of radio teeth, because they are mostly quiet people who shun attention. If your students would like to do some research on crystal radios, they may find that it is possible to receive radio signals on a razor blade! I have written 99 books other than Fat Men From Space. Anyone who reads all of them is likely to start hearing music in his head.