At one time it was popular amongst some physicists to be extremely critical of philosophy. For example, in their book The Grand Design , Stephen Hawking and Leonard Mlodinow aimed to answer a series of what have long been seen as philosophical (such as 'Why are we here?', 'What is the nature of reality?' and 'Did the universe need a creator?') by ignoring philosophy and taking a purely scientific viewpoint. Philosophy, those authors assured us, like religion, was now dead. I'm afraid Hawking and Mlodinow failed to convince, which is why it's perfectly reasonable for Jim Baggott to come up with a book on a physics topic, what 'lies beneath' quantum theory, and, along the way, to spend a fair amount of the book introducing philosophical concepts put across by philosophers. Quantum physics is arguably unique amongst the hard sciences in having a range of interpretations that run from 'We don't know what is happening and never will' (typi...