"The "Spin" is a total ghost story: Permanent magnets work because the intrinsic "spin" of unpaired electrons aligns in the same direction. But if you ask a physicist what is actually spinning, the answer is absolutely nothing. Electrons are mathematical point particles with zero physical radius; they physically cannot rotate. "Spin" is just an abstract quantum angular momentum value we plug into the Dirac equation because it happens to match reality" - Gemini