How did the human race populate the world? A group of geneticists have worked on the question for a decade, arriving at a startling conclusion: the "global family tree" can be traced to one African man who lived 60,000 years ago. Dr. Spencer Wells hosts this innovative series, featuring commentary by expert scientists, historians, archaeologists, and anthropologists.

Ken Burns's Emmy Award-winning documentary brings to life America's most destructive and defining conflict. The Civil War is the saga of celebrated generals and ordinary soldiers, a heroic and transcendent president and a country that had to divide itself in two in order to become one.

"Judgment day: intelligent design on trial" captures the turmoil that tore apart the community of Dover, Pennsylvania, in a landmark battle over the teaching of evolution in public schools. In 2004, the Dover school board ordered science teachers to read a statement to high school biology students about an alternative to Darwin's theory of evolution called intelligent design--the idea that life is too complex to have evolved naturally and so must...