Scientists have used skin cells to create human eggs. The new technology could be a crucial step that would allow infertile women or same-sex couples to have babies with their own genes. @npr reports on how they did this, and the many ethical concerns around the technology, from "designer babies," to whether someone could create a child using only one person's genetic material. "There are 8 billion people in the world and some of them have very strong egos and some are very rich. So I wouldn't guarantee that no one would want to do that," says bioethicist Hank Greely.

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