I was reading about the Pauli exclusion principle and this question occured to me about the electron. It can be +1/2 or -1/2 spin. And usually atoms outside stars (where it is cool enough to attach electrons) seem to have their orbitals filled with enough electrons to appear neutral. So I assume there are similar number of electrons with +1/2 and -1/2 spin, and they are quite evenly mixed. Is this true/generally true? Is there no assymetry like in matter antimatter?