Boxers, NFL players and plenty of other athletes sustain concussions all the time. But when is a bump on the head more than just a little injury? When a retired athlete's life starts to fall apart, can you blame the brain?
If a fire headed toward your house, you might be tempted to rescue a precious memento like a photo album or a child's blanket. When dementia heads for the brain, there's no chance of saving your memories.