Despite Alzheimer’s plaques, some seniors remain mentally sharp
Proteins linked to dementia don’t diminish memory in some brains
![elderly woman](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2016/11/111616_LS_alzheimers_main.jpg?fit=860%2C460&ssl=1)
MANY MARBLES A small number of very old people retain good memories, despite having signs of Alzheimer’s in their brains, a new study suggests.
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