Could This 8-Year-Old Be The Key to Immortality?

Gabby Williams is eight years old, but looks like a newborn. She is one of only a handful of people across the world who age at an incredibly slow rate, and scientists are trying to figure out why. Once they do, the discovery could help fight Alzheimer's, and even give us an aging "off switch," which would give humans… » 8/18/13 10:06pm 8/18/13 10:06pm