1 Just What Did He Jiankui Do?

We don't really know. That's the only honest answer. It is a frustrating answer to give at the beginning of a book about his actions. And it is not the answer I expected to be able to give so long after the story first shocked the world. But, as I write this in February 2020, we have far more questions than answers. And the answers we have are from very limited and suspect sources.