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Researchers from Loma Linda University studied 20 healthy adults in their sixties and seventies. For the study, one group was asked to sit silently—no talking, eating, or fiddling on their cell phones. The other group watched funny videos. After 20 minutes, both groups were given memory tests and asked to provide saliva samples. The people who watched videos had lower levels of the stress hormone cortisone and also performed better on the memory tests so
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