>> is that with what my kid's going to say to me when he's 10? >> you're blameless because the technology wasn't there. >> as a society, as a species, we're going to evolve and there's going to be an ethical responsibility we have to our kids to make them healthy. >> yeah. >> you know, a whole generation that that basically we would betray if we didn't help them. basically that's cruel. >> what are the scary aspects of where this could potentially go? >> i think it will get very hot in the next few years in editing genomes for babies. >> where you'll be able to go in and kind of just order the perfect child? >> yes. we could potentially see like an arms race among families -- >> to create the fastest, biggest, strongest, smartest. >> yeah. well, let's take out the correct copies of dna. >> this is incredible.