Millions of viewers watched Diane Sawyer's landmark interview with Jaycee Dugard, who was kidnapped at age 11 on her way to school and held captive for the next 18 years, during which time she was repeatedly abused and gave birth to two daughters. Many of those viewers filled the ABC News message boards with remarks about her survival and resilience. Now Chris Cuomo takes a closer look at Dugard's healing process, which includes a special horse therapy that has been an essential part of her treatment.

What happens to a family when a child's birth becomes a medical mystery? Barbara Walters reports on Kaylee Halko and Lindsay Ratcliffe, two vibrant young girls who suffer from a rapid-aging disease called progeria, a fatal condition that currently affects 80 known children in the world. The disease causes children to age at 10 times the normal rate. It is incredibly rare - occurring in only one of every four to eight million births - and always fatal. On average, children die at the age of 13.