In this first episode of a three-part series, George explores In this first episode of a three-part series, George presents the history of an idea – The Arrow of Time. He starts off showing humans have not always seen time as a unique past pointing to a unique present and then to a unique future. There have been several competing models of time, from the cosmic wheel of time to the cyclical model of time, and from the regressive to the flux and Nemesis models of time.