'...a veritable fireworks of ideas in computation, physics and cosmology...The distinction of the participants and the intrinsic interest of the topics discussed make this a book that should be available to all physicists as well as to students of cognate subjects.' Peter T. Landberg, Nature
'By far the best available account of current ideas on the issue, presented by those most qualified to do so. It is outstanding in its presentation and overall quality and most certainly stands out as one volume which should find its way onto the shelves of every researcher seriously interested in this field.' Classical and Quantum Gravity
'One feature which I enjoyed was the reproduction of the lively questions and discussion following the papers.' Professor P. Knight, Contemporary Physics
'...an in-depth introduction to a fascinating set of inter-related topics about the nature of time. It is written at a level that is sure to be stimulating to a sophisticated theorist while still accessible to a young graduate student.' Physics Today
"...a veritable fireworks of ideas in computation, physics and cosmology. Some of the discussion is also recorded, and this adds considerably to the reader's understanding and enjoyment of the book....The distinction of the participants and the intrinsic interest of the topics discussed make this a book that should be available to all physicists as well as to students of cognate subjects." Peter T. Landsberg, Nature
"...[provides] an in-depth introduction to a fascinating set of inter-related topics about the nature of time. It is written at a level that is sure to be stimulating to a sophisticated theorist while still accessible to a young graduate student." Gino Segre, Physics Today
"...sure to plant the seeds for further lines of investigation on this intriguing and very fundamental set of issues." Robert Waid, Foundations of Physics
