Judith Chase Gilbert, J.R. Aguilar

In this photo taken May 19, 2015, Judith Chase Gilbert, of Arlington, Va., is loaded into a PET scanner by Nuclear Medicine Technologist J.R. Aguilar at Georgetown University Hospital in Washington. Gilbert shows no signs of memory problems but volunteered for a new kind of scan as part of a study peeking into healthy brains to check for clues about Alzheimer’s disease. (AP Photo/Evan Vucci)

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