- https://youtu.be/tR6UebCvFqE?t=23 particle at rest
- https://youtu.be/tR6UebCvFqE?t=322 unidirectional movement without a potential
- https://youtu.be/tR6UebCvFqE?t=507 shows that observers in different frames of reference also see different spin. We are reminded of how magnetism is just a side effect of special-relativity.
- https://youtu.be/tR6UebCvFqE?t=549 Dirac equation solution for the hydrogen atom, final result only + mentions fine structure prediction.
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