Hope or Hype? Stem Cell Treatments in China; Operation Purple: A New Way for Soldiers' Kids to Cope; World Report Index: Longevity - American patients are racing to China for a therapy they can't get in the U.S.: stem cell treatments for everything from MS to Alzheimers to blindness. Some say they get revolutionary treatment and can be cured. Others say it is all hype, and not science. World Report weighs the costs, the hopes, the risks as we join patients on a medical odyssey. Then, Operation Purple. Help for soldiers' kids whose parents are sent to fight in Iraq or Afghanistan: a special summer camp, where they learn key coping skills, and find a unique camaraderie. Finally, the debut of the "World Report Index". This week: which countries top the list for life expectancy? And what's the secret to staying vibrant and healthy well past 100?