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Re:Exercise may help slow cognitive decline in some people w... by DoreenMichele on Saturday April 03, 2021 @12:03PM (#26682099)
Exercise moves lymph out of the general tissues, though the brain only moves lymph in sleep. This is how the body "takes out the trash."

Longer explanation in previous comment:

https://news.ycombinator.com/item?id=25427090

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