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Thomas Harriot (1560-1621) was a pioneer in both the figurative and literal sense. Navigational adviser and loyal friend to Sir Walter Ralegh, Harriot took part in the first expedition to colonize Virginia. Not only was he responsible for getting Ralegh's ships safely to harbor in the New World, once there he became the first European to acquire a working knowledge of an indigenous language (he also began a lifelong love of tobacco, which may have been his undoing). Harriot's abilities were seemingly unlimited and nearly awe-inspiring. He was the first to use a telescope to map the moon's craters, and, independently of Galileo, discovered and recorded sunspots. He preceded Newton (whose fame eclipsed his) in his discovery of the properties of the prism. He was arguably the best mathematician of his age, and one of the finest experimental scientists of all time. Yet Harriot has traditionally remained a tantalizingly elusive character. He had no close family to pass down records, and few of his letters survive. Most importantly, he never published his scientific discoveries, and half a century after his death he had all but been forgotten. In recent decades, many (self-styled "Harrioteers") have become obsessed with restoring to Harriot his right place, but Robyn Arianrhod's biography is the first actually to do this, and she has done it the only way it can be done: through his science. Using Harriot's re-discovered manuscripts, Arianrhod illuminates the full extent of his achievements in science and physics, expertly guiding us through what makes them original and important, and the story behind them. Because he hadn't yet polished them for publication, Harriot's papers also proffer unique insight into the scientific process itself. Though his thinking depended on a more natural, intuitive approach than those who followed him, Harriot laid the foundations of what in Newton's time would become modern physics. Arianrhod's biography offers the human face of scientific discovery, a lived example of the way in which science actually progresses. Set against the backdrop of the Elizabethan world with all of its dramas and creative tensions--Harriot's years almost exactly overlap those of Shakespeare's--this biography gives proper due to one of history's most remarkable minds.