"Protons behave like quantum spinning tops with spin ½ in units of Planck's constant \hbar. This spin is responsible for many fundamental properties of nature including the proton's magnetic moment, the different phases of matter in low temperature physics, the properties of neutron stars and the stability of the known Universe. One of the main questions in particle and nuclear physics the last 20 years has been: How is the proton's spin built up from its quark and gluon constituents?"
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Steven D. Bass:
https://en.wikiquote.org/wiki/Spin_(physics)
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Spin (physics)
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