Monuments like Stonehenge were ancient efforts to grapple with the nature of time. But how well do we understand this enigmatic dimension today?
In a forthcoming book, In Search of Time: Journeys along a Curious Dimension, science journalist Dan Falk takes readers on a quest to learn what we know about the nature of time. The journey ranges from geological "deep time" revealed in the walls of an Arizona canyon, to the monuments of stone-age England and Ireland, to the atomic clock at the U.S. Naval Observatory, to the latest ideas on time travel. Along the way, Falk speaks with anthropologists, historians, psychologists, neuroscientists, astronomers, and physicists.