Miles O’Brien:

Allegedly, he went after the gene that is responsible for a protein that HIV uses to infect a human being. So, in theory, if what he says is true, these two young girls would be resistant to HIV.

Now, He didn't really release the full data. He didn't run this by his university. It appears he didn't even tell the parents fully what they were getting into. The thing may not have worked, as far as we know.

And I should also note that He has not been seen in public since that conference. He did tell us, though, that there is another child being carried to term that has been edited in some fashion, although we don't know much about that.

So, suffice to say, it's sketchy. We should keep our skepticism levels very high here as to what he's accomplished. But I will tell you this. It has caused a huge controversy in the scientific community, because what He has done, if he did what he says he did, has crossed a big red ethical line, because these changes to their genes are hereditary.

In other words, they're permanent changes introduced into the body of human beings. And that has all kinds of potential consequences. And we will be watching this closely next year for sure.