Death and Greed at the Dentist Brian Ross investigates the children under anesthesia for dental procedures. Massive Avalanche Disaster in Alps Climbers were swept away by a 60-foot wall of snow moving at 100 mph. LMFAO: On the Town with Party Rockers Neon costumes, body paint, raunchy lyrics: We go backstage with the LMFAO duo. The Clumsy Leopard Nat Geo filmmakers follow a less-than-graceful big cat as he grows. Model Battles 'Facebook Stalker' Her tweets and photos online earned her fans, including a man who made threats. On the Hunt for Great White Sharks "Nightline" goes swimming with sharks in an unlikely place -- off Cape Cod. Is a Big Tobacco Company Profiting From Kids? "Nightline" investigation into an epidemic of chain-smoking Indonesian youth. Matchmaker Helps Brainiacs Find Love This woman guides Silicon Valley bachelors to single women in San Francisco. Spirit Air Nightmare: 14-Hour Layover Passengers stranded after an emergency landing. Paging Dr. Oz He's famous for being on TV, but Dr. Oz is a practicing heart surgeon. 'Dark Knight Rises' Details Revealed Director Christopher Nolan talks about why this is his last "Batman" film.