Common diabetes drug found to induce brain cell growth

This particular bit of information which was in the news some weeks ago is of interest because it appears to be the first known instance of a drug which can actually cause new brain cells to form:

Common Diabetes Drug Found to Stimulate Brain Cell Growth, May Treat Alzheimer’s and Stroke Patients

…metformin increased the number of new neurons in the hippocampus or the area of the brain involved in making new memories, by about 30 percent compared to controls.