The Globe

Originally published as The science of Discworld II in Britain by Ebury Press, an imprint of the Random House Group Ltd., London, in 2002.

TERRY PRATCHETT is the acclaimed creator of the bestselling Discworld series. He was appointed OBE and a Knight Bachelor in recognition of his services to literature.

IAN STEWART is a Fellow of the Royal Society, professor of mathematics at the University of Warwick, and author of numerous books on math and popular science, as well as science fiction novels co-authored with Jack Cohen.

JACK COHEN is a professor of biology and honorary professor of mathematics at the University of Warwick, and has co-authored several books with Ian Stewart.