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Research on the brain has advanced to such a degree that scientists can now grow artificial brain-like material in the laboratory. Will there come a time when these "organoids," as they're called, will be entitled to human rights? Medical ethics experts in the United States say it's time to address this. Hank Greely is a professor of bioethics at Stanford Law School

(Photo: Human brains in laboratory. Credit: Dan Kitwood/Getty Images)