<p>1543 saw the publication of one of the most significant scientific works ever written: <i>De revolutionibus</i> (<i>On the Revolutions of the Heavenly Spheres</i>), in which Nicolaus Copernicus presented a radically different structure of the cosmos by placing the sun, and not the earth, at the centre of the universe.<br><br>But did anyone take notice? Harvard astrophysicist Owen Gingerich was intrigued by the bold claim made by Arthur Koestler in his bestselling <i>The Sleepwalkers</i> that sixteenth-century Europe paid little attention to the groundbreaking, but dense, masterpiece. Gingerich embarked on a thirty-year odyssey to examine every extant copy to prove Koestler wrong...<br><br>Logging thousands of hours and hundreds of thousands of miles Gingerich uncovered a treasure trove of material on the life of a book and the evolution of an idea. His quest led him to copies once owned by saints, heretics, and scallywags, by musicians and movie stars; some easily accessible, others