My Sister, My Clone

I have a clone. She lives in Pittsburgh, Pennsylvania, and her name is Diana. She's my body double: blond hair, hazel eyes and fair skin. She's 1 cm taller, but we have the same voices and the same mannerisms. We're both unmarried. We love to read, we relish Mexican food, and we get the same patches of dry skin in winter. We both play tennis and golf. O.K., she's funnier than I ambut just a little.

In the debate over the ethical, emotional and practical implications of human cloning, identical twinsdistinct beings who share the same DNApresent...