Understanding how we pinpoint the past is crucial to putting the present in perspective and planning for the future. Now, for the first time, journalist and geologist Chris Turney explains to the non-specialist exactly how archaeologists, paleontologists, and geologists "tell the time." Each chapter explores one famous event or object from the past, walking readers step by step through the detective work used to determine when things happened. From the Ice Age to the pyramids, from human evolution to the Shroud of Turin, Turney reveals how written records, carbon, pollen, constellations, DNA...