Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: A goldmine of information for the hard of hearing

Kudos to clinical audiologist Richard Carmen for assembling this all-star cast of experts. I found this affordable, accessible volume to be loaded with interesting and practical information for us hard of hearing. Audiologists and scientists discuss the psychology and management of hearing loss, and new hearing technologies, and answer lots of questions: What causes ringing in the ears? How do aging, drugs, and noise affect hearing? What are the varieties of hearing aids now available? What cool new hearing assistance technologies might improve my life?