Part I: The basics -- Hearing basics -- Brain plasticity and perceptual learning -- Multisensory processing -- Part II: The problem -- Hearing problems -- Types of hearing loss -- Part III: The causes -- Causes of acquired hearing loss -- Epidemiology and genetics of hearing loss and tinnitus -- Early diagnosis and prevention of hearing loss -- Part IV: The treatments -- Hearing aids -- Implantable hearing aids -- Cochlear implants -- Part V: The future -- Auditory brainstem and midbrain implants -- Repairing and building new ears