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Jack Hanna diagnosed with dementia, stepping back from public life

Columbus Zoo Director Emeritus and renowned animal expert Jack Hanna has dementia that may be related to Alzheimer's disease and has stepped away from public appearances, according to his family. "While Dad's health has deteriorated quickly, we can assure you that his great sense of humor continues to shine through," Hanna's daughters wrote in a social media post, adding "he still wears his khakis at home."

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