Various videos related to this subject. An excellent video lecture, in three parts, can be found at the following URL [copy and paste]. Hans Bethe covers many aspects of Quantum Mechanics and resolves often misunderstood issues such as entanglement and uncertainty. Uncertainty prevails only at the size of the atom and not with some cat in a box, for example. We would not be here but for quantum mechanics, without it there would be no atoms and no existence. Particle and atomic structure are shown to be beat patterns of various waves in space. The link is below: bethe.cornell.edu/index.html