Overview: "Exonerated" looks at the Innocence Project of Texas which is working to free wrongfully accused prisoners. "What Really Happend to Pat Tillman?" interviews Pat Tillman's mother about her dissatisfaction with the government's investigation of her son's death. "Dr. Farmer's Remedy" profiles a doctor who has devoted his life to delivering medical treatment in Third World countries. "Andy Rooney" looks at the career of Mike Wallace to honor his birthday.