For 71 years, Lou Gehrig has been the face of Amyotrophic Lateral Sclerosis, or ALS, now most commonly known as "Lou Gehrig’s disease."

After getting the diagnosis of a disease that would quickly rob him of his muscle strength and control, Gehrig retired from baseball. At a ceremony honoring him at Yankee Stadium on July 4, 1939, his voice full of emotion, he said, "Today I consider myself the luckiest man on the face of the Earth. That I might have been given a bad break, but I’ve got an awful lot to live for. Thank you." He died just two years later of the disease that now bears his name.

Now new research suggests that there is a possibility Lou Gehrig may not have had "Lou Gehrig’s disease," but perhaps something closely related.  

The Super Bowl will be played in Tampa on Sunday and a group of Boston University researchers has gathered there in advance of the game. They are announcing findings of an investigation into brain injury in one former NFL player that is part of a still controversial body of evidence that may link professional football to brain damage. For more, we ask Dr. Robert Stern, an Associate Professor of Neurology at Boston University, to explain his findings and what this could mean for the NFL.