For decades, scientists have targeted the sticky protein clumps that amass in Alzheimer's brains as a potential way of treating the disease, but they may have been off the mark. A new study shows that clearing away the amyloid-beta clumps doesn't appear to repair key brain functions. In particular, it doesn't restore the brain's mechanisms for clearing out waste, known as the glymphatic system. This system is known to be impaired in people with Alzheimer's , and would usually help with getting