SMA, which stands for Spinal Muscular Atrophy, occurs in one of every 6,000 births. Commentator Ben Mattlin has a SMA and is paraplegic. He is often asked what he would do if a cure became available.

Brain atrophy refers to a loss of brain cells, or a loss in the number of connections between brain cells. It can occur as a result of the natural aging process, injury, infection, or certain health ...