For people suffering from heart failure, simply walking to the mailbox can seem like an impossible challenge. But now, an experimental heart surgery may provide dramatic relief. The innovative source of this treatment is a patient's own stem cells. A small scar can be life changing. It means for the first time in six years Richard Howell is enjoying retirement. For six years, heart failure left Richard too weak to leave his living room. And it put him at risk for other serious health problems, including organ failure. Richard Howell: "I'd get up and walk across the kitchen; I would...