16 Mind-Boggling Discoveries Scientists Made in 2017

A tool to repair DNA in ­embryos

Chinese scientists devised a gene-editing tool that may eliminate certain disease-causing mutations in the DNA of human embryos. It is the first such technology to be used on viable human embryos and could one day help prevent ­babies from inheriting serious genetic diseases. But it has already raised ethical concerns about the potential to effectively design children—and alter the genetic heritage of humankind.

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