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  • What to know about COVID-19 vaccine rollout for kids under 5

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Brain study aims to shine light into Alzheimer's, other degenerative diseases

05:37

Maria Shriver and Dr. Andre Machado of the Cleveland Clinic join the 3rd Hour of TODAY to announce a new partnership and groundbreaking study into degenerative diseases. The study is the largest in the world and could find answers in the fight against Alzheimer’s and many other conditions. “We want to follow normal individuals, without neurological disease, over a long period of time and learn how the brain ages into health or disease,” Machado says.