you usually die by the anyone of 4 years old. so if you have another kid and your partner has it -- >> my kid would get it. >> here's the error. >> that's the one error that's wrong. >> we're going to correct that copy. >> how do you get that into my body? >> currently the technology is not, i think, really good enough. we need to make ways that are much safer that don't result in problems like your immune system going crazy. >> shut downs? >> exactly. >> we don't want that. >> we're going to show you how we make the dna. >> all life comes from four chemicals. there's an a, c, a t and there's a g. we take code and turn it into a,