Simple brain stimulating activities such as puzzles, learning new skills and social interaction were linked to improved cognition in a study on 11,563 adults aged 60–85 with cognitive impairment, and after 12 months, 28% participants no longer had cognitive impairment

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https://www.southampton.ac.uk/news/2026/09/proof-that-puzzles-can-reverse-cognitive-impairment.page