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Canst thou not minister to a mind diseased, Pluck from the memory a rooted sorrow, Raze out the written troubles of the brain And with some sweet oblivious antidote Cleanse the stuffed bosom of that perilous stuff Which weighs upon the heart? – Shakespeare, Macbeth,...

Crossing the blood-brain barrier can be a good thing. The blood-barrier normally protects the brain from attack by toxins and infection. This same protective quality prevents drugs reaching areas of the brain that are affected by disease such as brain cancer. Researchers in Canada were able...