The world’s most powerful gene-editing tool, CRISPR-Cas9, gives humans the ability to swap out sections of the genome with less money and time than ever before. That’s a lot of power, and with great power comes great responsibility.
But right now, most of the world doesn’t have regulations about what scientists — and someday, hobbyists — can and can’t do to the double helix. In China, scientists have used CRISPR-Cas9 to modify human embryos. And that has left the rest of the world a littl