curing genetic disease. >> by having the ability to rewrite genetic code, we could erase mutations that give rise to terrible diseases. the put in a healthy copy for a gene and completely eradicated from that family street. >> in a controversial report, the national academy of sciences concluded after more research, trials for this experimentation may have a place to help parents who both carry a gene that would guarantee a child having a genetic disease. many worry this could feed a desire not just for a healthy baby but one genetically designed to be more gifted. >> in the search for absolute perfection, this has been destroying life. that's where we draw the line. >> the embryos in the research were destroyed after just a few days, none were ever implanted. for those doing the scientific work, that is the ultimate goal. congress passed a law two years ago prohibiting the government from funding this type of gene editing research but that's had