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She repeatedly says "the brain does not have a lymphatic system", but wasn't that discovered to be incorrect prior to this video recording?

What am I missing?

I too thought synapses clean themselves during deep sleep, just not that we'll understood. And as far the lymph system + brain article(0) links =>(0) 2015 https://www.nih.gov/news-events/nih-research-matters/lymphat...