Twins are famously close. But conjoined twins take intimacy to the extreme, sharing arms, legs, hearts and other organs – even brains. Such twins are rare, occurring in about one out of every 200,000 live births, experts say. But the recent birth of conjoined twins in Chicago and successful separation of another set of conjoined twins in Memphis have put conjoined twins in the spotlight. Siamese twin girls Siamese twins  Siamese twin girls Siamese twin girls siamese twin girls