 To the best of our knowledge our world is fundamentally quantum mechanical, not classical mechanical. Does this change the situation? “Maybe” is perhaps the best answer. Not surprisingly, answers to the question are affected by one’s interpretation of quantum mechanics. Quantum mechanics suffers from the notorious measurement problem, a problem which demands one or another interpretation of the quantum formalism. These interpretations fall broadly into two types, depending on their view of the unitary evolution of the quantum state (e.g., evolution according to the Schroedinger equation): they either say that there is something more than the quantum state, or that the unitary evolution is not entirely correct. The former are called “no-collapse” interpretations while the latter are dubbed “collapse” interpretations. This is not the place to go into the details of these interpretations, but we can still sketch the outlines of the picture painted by quantum mechanics (for more see Albert 1992).