Avian Flu, Pt. 1 and Pt. 2

Nobel Prize-winner and co-host Sir Paul Nurse and a panel of scientists explain the H5N1 virus and analyze the threat of a pandemic that could kill 70 million people; the conversation continues with Sir Paul Nurse and policy makers from the U.N., C.D.C., and W.H.O. discussing global and national preparedness for a possible pandemic.