" For Aristoteles, the two ways of making conjoined twins bear on their individuality. He rules that if conjoined twins have separate hearts, then they are the products of two embryos and are two individuals; if there is only one heart, then they are one. The question of conjoined twin individuality haunts their history.
Thomas Aquinas thought that it depended on the number of hearts and heads (thereby ensuring perpetual confusion for priests who wanted to know how many baptisms conjoined infants required)."
In "Mutants", de Armand Marie Leroi, acerca dos gémeos Siameses.
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