Genes influence health and disease, traits and behavior. With new tools available to edit those genes, scientists are now working towards things that once seemed impossible: creating immunity to viruses, eliminating genetic diseases—even resurrecting the woolly mammoth.
But when it comes to humans, scientists must contend with a question that will shape their work in the decades to come: Is it ethical to genetically engineer people?
Leading geneticist George Church spends a lot of time thinking about the answer.
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