From the text: The best known chair in mathematics at Cambridge is the Lucasian. Newton was the second holder of the post, Stephen Hawking the most recent. The fourth was a man blind from infancy called Nicholas Saunderson. A problem which intrigued people in the eighteenth century is named after its most distinguished student, Euler, but Saunderson laid the groundwork, as we shall see. The problem is to find a cuboid where both the edges and the face diagonals are integral.