I try not to post about random physics stuff but I can't help myself this morning. Bear with me.

Over at [personal profile] physics, someone asked a question about the non-intuitive nature of fermions' 1/2 spin i.e. how it's possible that fermions (electrons & quarks) must "rotate" 720 degrees before returning to an identical state.

Some answers were helpful but technical: The rotation you speakest of is not performed in real space. In real space the corresponding thing to a spin is the magnetic quantum number which tells you about the discrete rotational symmetry of your particle with respect to rotations of 360deg/m.

BUT, someone else, both acknowledged that it's not a real space analogy and also provided a real world example. THEN, another person jumped in to say that they made a youtube video of how the example works.

SOMEONE MADE A YOUTUBE VIDEO OF A REAL SPACE ANALOGY OF FERMION 1/2 SPIN.

If you have no idea what I'm talking about and remotely care, just check out the video. You'll see that the mug has to rotate twice to return to it's exact original state.
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