Original sentence: One notable text in Big History is David Christian's Maps of Time: An Introduction to Big History, which explores history from the first micro-seconds of the Big Bang, to the creation of the solar system, to the origins of life on earth, the evolution of humans, the agricultural revolution, modernity, and the 20th century
Edited sentence: As of 2005, the essential text in Big History is David Christian's Maps of Time: An Introduction to Big History, which explores history from the first micro-seconds of the Big Bang, to the creation of the solar system, to the origins of life on earth, the evolution of humans, the agricultural revolution, modernity, and the 20th century