It has happened to you. Some song wriggles its way into your brain and won't leave. Now imagine that the distant tune in the back of your head suddenly becomes very real. A real song. Real drums. Real guitar. Volume. These are called musical hallucinations and there are some people ...

Michael Chorost was born with a severe hearing impairment, the result of a rubella epidemic in the 1960s. He used hearing aids, learned to speak, went to regular schools and got his Ph.D. in English. Then, a few years ago, Michael's residual hearing abruptly gave out. His ...