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.
A tumor in the soft tissue or bone of the knee joint can also cause pain in the back of the knee. In addition to discomfort, a tumor will likely include the appearance of a palpable mass, trouble. bending the knee and pain even when no weight is being placed on the legs.