Will Lithium Really Save Your Brain?

There is an element sitting in your brain right now, and nobody has established how much you are supposed to have. It may shape how you think, how you act, and whether your mind holds up as you age. Last year a Harvard lab placed it near the center of Alzheimer's, arguing that running short of it may be one of the first things that goes wrong in the diease. It is already sold as the next longevity compound, the thing that finally protects the aging brain, and the people selling it have ...