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. so for me to live forever, i need to hack my dna. >> we will eventually be able to write the code not only to fix our current mistakes but also to fix mistakes as we age. and that's going to be critical to living forever. there you go. >> that's nuts. >> correct copies of your dna. so if you want to access any of these sequences you'll break the foil with the tip, add some liquid. >> brand new genome, just add