How can it be that some elementary particles (like quarks) have spin equal to 1 2?
Answer from: Konstantin Dokuchaev:
Author of the coolest blog All-in-One Person...
Many elementary particles have a spin of 1:2 to be exact, ħ:2. For example, electrons, protons, neutrons. That's the nature of it. It's not clear what's particularly striking here.