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the quantization of spin so particles they they kind of spin they have a certain Ang angular momentum that angular momentum even though the masses
of particles are all over the place you know the electron has a mass of 511 M the but you know the proton is 938 M etc etc etc they're all kind of random
numbers the the spins of all these particles are either integers or half integers and that's a fact that was discovered in the 1920s I guess um the U
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