Sometimes a person can suddenly lose part or all of their hearing, due to unknown causes.
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The context of Giftedness and Talent Development Resources for Gifted Children - Resources about gifted children. What's New in Learning Disabilities - Information on Learning Disabilities, Learning Disorders, ADD, ADHD, Dyslexia, Dysgraphia, Dyscalculia, Dysnomia, Speech. Learning Disabilities Association - General Information and resources on Learning Disabilities. Possible causes of Mental Retardation. What problems might occur.