Simon Friederich is associate professor of Philosophy of Science at Groningen University and holds PhDs in both physics and philosophy. His work on multiverse theories was supported by a Veni grant from the Netherlands Organization for Scientific Research.

• Preface; Part I. Setting the Stage: 1. Introduction; 2. The fine-tuning considerations; 3. Fine-tuning for life and design; Part II. Fine-tuning for Life and the Multiverse: 4. The standard fine-tuning argument; 5. Problems with priors; 6. A new fine-tuning argument; Part III. Testing Multiverse Theories: 7. Testing multiverse theories: approach; 8. Approaching practice; 9. Puzzles of self-locating belief; Part IV. Wider Still and Wilder: 10. Other multiverses; 11. Outlook; References; Subject index; Author index.

'In recent years multiverse theories have attracted a great deal of attention among physicists, promising simple resolutions to fundamental long-standing problems. Philosopher of science Simon Friederich provides here a valuable, careful examination of these claims and their relation to testable science. The problems posed by the advent of such theories that arguably cannot be shown to be wrong seem to be here to stay. Friederich's comprehensive and even-handed account of all sides of the question of where we are now with this new sort of science has an important role to play.' Peter Woit, Columbia University