I’ve heard in several places that we must view the spin of subatomic particles not as we would that of a classical object since, if we did so, we would find that the velocity of the spin would be so great as to violate the light speed limit to achieve their magnetic moments or whatnot. Can someone re-paraphrase that argument for me one, and two, please address this follow up question. I’m guessing that the violation of the c limit problem comes from the tangential velocity of the spinning particle? I’ve done some calculations and it seems as though the particle would have to be spinning at an absurd rate to exceed the speed of light in meters per second tangential velocity. The reason is the extremely short radius of subatomic particles. Tangential velocity = angular velocity times the radius. Thus, for a proton spinning at 1 billion revolutions per second, its tangential velocity would only be 4.5 x 10^-8 m/s. Thus, the proton would have to be spinning at 16 orders of magnitude faster than that in order to approach the speed of light and therefore violate it. What’s going on here? Is my reasoning way out in left field here, or am I missing something?