"We are used to being told confidently of an enormous, measurable past: that some collection of dusty bones is tens of thousands of years old, or that astronomical bodies have an age of some billions. But how exactly do scientists come to know these things? That is the subject of this quite fascinating book.... As told by Hedman, an astronomer, ... Read moreeach story is a marvel of compressed exegesis that takes into account some of the most modern and intriguing hypotheses." - Steven Poole, Guardian "Hedman is worth reading because he is careful to present both the power and peril of trying to extract precise chronological data. These are all very active areas of study, and as you read Hedman you begin to see how researchers have to be both very careful and incredibly audacious, and how much of our understanding of ourselves - through history, through paleontology, through astronomy - depends on determining the age of everything." - Anthony Doerr, Boston Globe" Show Less