 The Alzheimer's Association and the Ad Council present the story of Tom and Levi. Tom is the smartest man I know. He's been a professor at two major universities. He's been a teacher for over 40 years. One day he told me that he was having problems in his classes. I think one of the students had asked the question and he didn't remember the answer. I also noticed that he was letting his class out earlier than they were supposed to let out. And he was telling them that he was doing it as a favor to them. But I think in reality...