Swine Flu Pandemic; Dr. David Kessler; Food Safety

Science and health journalist Donald McNeil, Dr. Richard Besser, and Dr. Anthony Fauci explain what the H1N1 virus is, when a vaccine will be available, and how to stay healthy. Pediatrician David Kessler shares his findings about the link between obesity and disease from his book, "The End of Overeating." Food safety experts Michael Pollan, Michael Moss, and Jeffrey Bender shed light on food contamination, poor regulatory oversight, and how food is processed in ways that consumers don't understand.