Child Alzheimer's? Disease Attacks Twins' Minds

Twin 4-year-old girls Addison and Cassidy Hempel are similar to their contemporaries in many ways: They love nursery rhymes; "Humpty Dumpty" is the family favorite; they go to school and play house. But the identical siblings differ from other children in one major way. The girls' world of childhood fantasy is haunted by a heartbreaking reality that they are fighting a disease that seeks to steal their memories. Like a pediatric version of Alzheimer's disease, Niemann-Pick Disease Type C...Full Story
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