1. Cut, Paste, Life

Gene-editing technologies promise to eliminate diseases, and biohackers push for access while scientists grapple with formidable ethical questions.

3. Changing an Entire Species

Using gene drive technology, humans have the chance to shape -- and eradicate -- whole species. But the implications alarm bioethicists and activists.

4. Our Next Generation

As Jackson gets ready for surgery, Maria and Victor await their “three-person baby” at a Ukrainian clinic that uses pronuclear transfer technology.