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Being a twin helpfully cracks open our ideas of individuality | Aeon Essays

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Being a twin (as our author knows) cracks open our ideas of the perfectly bounded self and might liberate us all

In Washington state in 2002, Lydia Fairchild nearly lost custody of her three children, when a test revealed that none of them shared her DNA. It turned out that Fairchild’s body was populated with cells from a non-identical twin she’d unknowingly had before birth, making her, in effect, the biological aunt of her own children. The technical term for Fairchild is a ‘human chimera’: a human being composed of cells that are genetically distinct. The phenomenon can happen artificially, through a transfusion or transplant, or naturally, as in Fairchild’s case, through the early absorption of a…

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