Part Three of the series "Time: The Story of Existence." In the 17th century, an Irish bishop judged the year of Earth's creation to be 4004 B.C.E. Although laughable by modern scientific standards, James Ussher's calculation was among the first of rigorous attempts to comprehend the vastness of geological history. Opens a window into time frames that dwarfs human life spans, evoking the insignificance of civilization in comparison to the age of the planet itself. Host Michio Kaku illustrates life's evolution by driving the distance between America's coasts with the final millimeter representing the human epoch. Also looks at the importance of DNA as a tool for studying human evolution. Original BBC broadcast title: "Earth Time." Accessibility options on the DVD are: (1) audio description, (2) expanded description, (3) subtitles for the deaf and hard of hearing.