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Boston GlobeEver wonder how we know with any certainty that the first humans arrived in the Americas about 11,000 years ago? Or that dinosaurs died out about 65 million years ago? Or that the solar system is about 4.5 billion years old?...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