Ray Hester with his wife, Sandy Hester, at home in Versailles, Ky., in June 2025. On its own, LATE dementia is less severe than Alzheimer’s, but in combination, it makes Alzheimer’s symptoms worse, scientists say. (Morgan Hornsby/The New York Times) By Pam Belluck A recently recognized form of dementia is changing the understanding of cognitive decline, improving the ability to diagnose patients and underscoring the need for a wider array of treatments. Patients are increasingly being...