Professor Hawking has probably been talking to the wrong philosophers, or picked up some wrong ideas about the kinds of discussion that currently go on in philosophy of science. His lofty dismissal of that whole enterprise as a useless, scientifically irrelevant pseudo-discipline fails to reckon with several important facts about the way that science has typically been practised since its early-modern (seventeenth-century) point of departure and, even more, in the wake of twentieth century developments such as quantum mechanics and relativity.

Science has always included a large philosophical component, whether at the level of basic presuppositions concerning evidence, causality, theory-construction, valid inference, hypothesis-testing, and so forth, or at the speculative stage where scientists ignore the guidance offered by well-informed philosophers only at risk of falling into various beguiling fallacies or fictions.

Three decades ago, Stephen Hawking famously declared that a "theory of everything" was on the horizon, with a 50 per cent chance of its completion by 2000. Now it is 2010, and Hawking has given up. But it is not his fault, he says: there may not be a final theory to discover after all. No matter; he can explain the riddles of existence without it.

The Grand Design, written with Leonard Mlodinow, is Hawking's first popular book in almost a decade. It duly covers the growth of modern physics (quantum mechanics, general relativity, modern cosmology) sprinkled with the wild speculation about multiple universes that seems mandatory in popular works these days. Short but engaging and packed with colourful illustrations, the book is a natural choice for someone wanting a quick introduction to mind-bending theoretical physics.

Early on, the authors claim that they will be answering the ultimate riddles of existence - and that their answer won't be "42". Their starting point for this bold cla