Researchers in South Korea say they have finally worked out how the brain flushes away waste – offering a clearer picture of the processes involved in dementia and other brain disorders that could one day be harnessed to treat them.The breakthrough, published this month in journal Cell, solved a puzzle that has stumped scientists since lymphatic vessels around the brain were first discovered roughly 250 years ago: how does our body clear away the waste?An international team led by Dr Koh...