Time and space were, from Death’s point of view, merely things that he’d heard described. When it came to Death, they ticked the box marked Not Applicable. It might help to think of the universe...

[Mathematics] is security. Certainty. Truth. Beauty. Insight. Structure. Architecture. I see mathematics, the part of human knowledge that I call mathematics, as one thing—one great, glorious thing. Whether it is differential topology, or functional analysis,...