An analysis has been performed of the theories and postulates advanced by von Neumann, London and Bauer, and Wigner, concerning the role that consciousness might play in the collapse of the wave function, which has become known as the measurement problem.
giving out or weakness of the knees can have different causes. These can include problems outside the knee joint itself (weak muscles for example) or inside the knee (torn ligaments or cartilage). See an orthopaedic surgeon to address your individual problem.
Hard to say: Typically osteoarthritis in the knee causes pain limited to the knee itself and not really the whole leg. It may just be a referred pain for the knee or you may have something else causing pain in the leg in addition to your osteoarthritis.