“There is a widespread belief about quantum mechanics, as also about relativity, that it is something that one is entitled to ignore for most ordinary philosophical and scientific purposes, since it only seriously applies at the micro level of reality; where 'micro' means something far smaller than would show up in any conventional microscope. What sits on top of this micro level, so the assumption runs, is a sufficiently good approximation of the old classical Newtonian picture to justify our continuing, as philosophers, to think about the world in essentially classical terms. I believe this to be a fundamental mistake. What I shall be arguing...is that the world is quantum-mechanical through and through; and that the classical picture of reality is, even at the microscopic level, deeply inadequate.”