Unnatural Selection

The First to Try

New gene therapies may change the lives of Jackson, Nick and Tristan. But on this risky frontier, nothing is guaranteed, and the price can be steep.

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.

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.