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.
Sciatica as a cause of knee pain is definitely a possibility due to a number of factors. This link of sciatica as a cause of the knee pain is due to the anatomical makeup of the sciatic nerve. Specifically, the starting point of the sciatic nerve is at the base of the spine.