They can even counter rotate like Contra-rotating propellers.
If the angular momentum in each direction is equal, does that mean zero total; or does one not influence the other?
I don’t have the depth of knowledge to look at these responses and say, this or that point is wrong. The best I can do is comment on what each contributor says to me.
Tavel: I have the impression that he was in a hurry to move on; or perhaps thought: “That’s good enough for the plebs”. If I could spot a sin, it would one of omission.
Bachmann: He address the subject of angular momentum and magnetic moment. He leaves the question of magnetic moment a bit vague, but one can’t expect too much in a brief response. He was obviously listening to the question, because he says: “It is analogous to the spin of a planet…”. His final comment is an interesting one; I wish he had said a bit more about “why”.
Stenger: My only objection to his opening paragraph is that he gives the impression that quons are little solid objects. On the plus side, he considers angular momentum.
His third paragraph has some good information, but he fails to clarify any connection between, for example, the Pauli exclusion principle and spin.
His final sentence has a degree of profundity, but leaves me wanting to ask him to explain why.
I guess that what I am saying is: “I don’t know which you have selected as being the right one. I think I would extract most from a combination of points from all three. If I have to select one, I think it must be Stenger, but it’s a shot in the dark. I’ll stick with bits of all three.