Right now, scientists can edit the genes of human embryos. Using an exciting technology called CRISPR (clustered randomly interspersed short palindromic repeats), they can make precise cuts in targeted sections of DNA and paste in new code.
But should they? Editing the genes of human embryos could prevent debilitating disease, but those changes will alter the germline — they will be passed on to subsequent generations. Where do we draw the line between prevention and enhancement? And who decides?