TIME.com - The Nun Study

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PHOTOGRAPHS FOR TIME BY Steve Liss

Since 1986, University of Kentucky scientist David Snowdon has been studying 678 nuns of the School Sisters of Notre Dame order residing at the convent on Good Counsel Hill in Mankato, Minn. His groundbreaking research in Alzheimer's could teach the rest of us how to escape the worst ravages of this heartbreaking illness

The Nun Study
How one scientist and 678 sisters are helping unlock the secrets of Alzheimer's

Self-Test: How Sharp Is Your Memory?

What Alzheimer's Does to the Brain

What You Can Do

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