that combines dna from three parents instead of two parents. the benefits, could help eliminate genetic diseases. is it opening the door to a demand for designer baby as some are calling them. joining me for a fair and balanced debate. the president of the council for fair and responsible genetics and dr. jeffrey steinburg. dr. steinburg, i want to start with you, why do you think we need to do this and do this right now? >> we understand that what we're doing is we're replacing a small typographical error that some human beings carry that causes horrible diseases in their children and it's not their fault. they're born with it or it develops. what we're doing for the first time is we're curing this process. so i think that this needs to be available and i think we also need to be cautious about what we're calling it. there's ns there not three pare