In May, Aimee Copeland, a 24-year-old graduate student at the University of West Georgia, went zip-lining with friends. But when the homemade line snapped near the Little Tallapoosa River, Copeland sustained a deep cut. Days later, she was diagnosed with a rare, dangerous flesh-eating bacteria, which ultimately claimed parts of all four of her limbs. Watch her walk across the stage of Katie Couric's new show.