Last week, a very famous man known to the world only as “HM” died in Windsor Locks, Connecticut at the age of 82. Henry Gustav Molaison, called HM to protect his identity, was a little boy in Hartford, when an accident changed his life forever. Over the next seven decades, HM would suffer severe seizures, undergo experimental brain surgery, and become one of the most famous patients in the history of brain science, the subject of hundreds of studies that forever changed the way we understand memory, learning, and identity.  Today on Where We Live, we'll talk to David Glahn, professor of psychiatry at Yale, about the the man he's been teaching about for a decade--though he's only just now learned his name.