An estimated 40 million people died from the 1918 worldwide influenza pandemic. Eighty years later scientists worry about where that particular strain came from and why it was so deadly, because a similar strain may be emerging. This PBS program examines the mistakes made by public health officials in 1918 and the lessons modern virologists can learn from that killer flu. Letterboxed. Filmmaker Bill Lyons; narrator Liev Schreiber. Educational Broadcasting Company. Closed captioned.