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Recently I was watching and reading about String theory, M-theory and the supersymmetry, when I remembered one question that I had while reading 'The Elegant Universe' by Brian Greene that is: why do the String theory need superpartners for all fermions and bosons from the standard model? I mean, for the little that I understand, supersymmetry MUST exists, because if not the String theory doesn't work or it's not possible. So, how really works, it's necessary for the String theory to be able to exist, or it just appears from the theory itself?

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