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PHOTOGRAPH BY RON WURZER / GETTY IMAGES
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A veterinarian by training, Hwang began to research cloning for a practical purpose: he wanted to create a better cow. But his work didn't stop in the barnyard. Hwang and his team at Seoul National University became the first to clone human embryos capable of yielding viable stem cells that might one day cure countless diseases. While such research raises troubling ethical questions, Hwang has already proved that human cloning is no longer science fiction, but a fact of life.
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