whoa... composite particles can have integer spin, such as helium-4, which makes them *bosons*. An aggregate of bosons can share the same quantum state. no exclusion principle! superfluidity and bose-einstein condensates make more sense now.

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this lecture by susskind on bosons and fermions is helping. also explains why half integer spin flips sign when rotating the wavefunction by 2pi. I guess this is why fermions are described by spinors. youtube.com/watch?v=A7PZftS7uO

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best part of this:

"There is a mathematical relation between the rotation by 2pi and the exchange of particles."

"Most theoretical physiscists dont know this"

youtube.com/watch?v=A7PZftS7uO

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