Babies without sex? Researchers are working on it. Ethicists are troubled. (Karen Weintraub)

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Scientists are getting closer to the possibility of making a new person from skin or blood cells, without the need for sex. Called in vitro gametogenesis, or IVG, it promises to someday provide a cure for many types of infertility, to slow or even turn off biological clocks, and to enable the kind of embryo selection that sends chills up many spines.

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