[dleviwing]

Robert;
Daniel's website is excellent for a fundamental understanding of QM. The premise that spin is a conserved property of nature is something I find questionable though. I view that motion itself is a conserved quantity and thus is absolute to all physical systems. The quantity of motion within an electron system is the same quantity of motion within a quark system or even the universe when taken as a system.
Spin does not define angular velocity and thus is locally dependent. All electrons have the same quantum spin value but do not have the same angular velocities. (see condensed matter or Bose Einstein condensate)

Daniel's thinking is similar to Milo Wolff and the equations for standing wave particles.

Best regards;
dleviwing