In a major new finding almost a decade in the making, researchers at Harvard Medical School say they’ve found a key that may unlock many of the mysteries of Alzheimer’s disease and brain aging — the humble metal lithium.

To find a cure for Alzheimer's disease, we need to understand how and where it gets started, and new research suggests we might be looking in the wrong place.

In a provocative new study, Harvard Medical School scientists found that lithium, an element found in some foods and drinking water and in trace amounts in our bodies, can confer resistance to brain aging and Alzheimer’s.