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Massaging the neck and face may help flush waste out of the brain
(www.newscientist.com)
This is a most excellent place for technology news and articles.
Study was done in mice, and it relies on massaging specific lymph nodes which are easily accessible for massage (sounds like most of the lymph nodes related to the brain-flushing mechanism are too deep in the neck to really get at).
Super curious if/where humans have analogues.