Augusta, Ga. resident Dr. Walter Watson is the oldest practicing physician in the country, and he has no plans of slowing down anytime soon. Steve Hartman continues the series, "Assignment America."

Watch the dolphins at SeaWorld Orlandos Dolphin Cove as they artfully create and play with underwater bubble rings and hear what SeaWorlds trainers, educators and guests have to say about this fun and fascinating behavior.

This 5 year old male was a pet in a home, and now lives at the Alaska Wildlife Conservation Center. This little guy had been given an apple to eat, and seems to act more like a puppy than a porcupine! His name is Stinkers.

Paul Nicklen describes his most amazing experience as a National Geographic photographer - coming face-to-face with one of Antarctica's most vicious predators.