Are modern human societies creating the perfect conditions for a major pandemic of bird flu? In this interview with leading physician and author Dr. Michael Greger, we explore how industrialized animal agriculture systems are a powder keg for new strains of avian influenza (bird flu). His book "Bird Flu: A Virus of Our Own Hatching" discusses the inevitability of a serious pandemic of bird flu -- expected to lead to millions of deaths worldwide -- unless the public health world takes this threat seriously and works towards prevention. Dr. Greger discusses lessons learned from the 1918 flu pandemic and what we can do to stop the next one.