>> ifill: jennifer doudna, how do we balance this out?cking into the human code sounds exciting to a scientist but might sound scary to a layperson. >> well, again, my feeling all along is i feel, as paul just said, very, very excited about the potential for this technology to affect human societies in the future in positive ways, but i do think it's a powerful technology, no question, and it needs to be handled with appropriate caution. >> ifill: jennifer doudna and paul knopfler, thank you both very much. >> thank you. >> ifill: since january 2013 journalist paul salopek has tracked ancient man's path out of africa, what he calls "the out of eden walk." tonight, we take another look at hari sreenivasan's visit-- and walk-- with paul, as they trace the footsteps of early man on his global trek. >> sreenivasan: the fog-shrouded fields and rolling hills of southern georgia are much more than a waypoint for paul salopek. we were nearing the ancient city and archaeological site of dmanisi. >> so, dmanisi is finally in sight, and this is prob

proceed but i do think the first step is to have that conversation. >> emanuel charpontier and jennifer doudna. >> reporter: the high hopes and high stakes associated with crispr have catapulted doudna into a rare stratum of scientific celebrities. last year she and her research partner received the$3 million breakthrough prize in life sciences, which seems to be only the beginning. >> your name has been floated repeatedly for the winner of the nobel prize in science. >> i'm just incredibly honored and shocked to see that. i don't honestly think much about it. >> why you surprise when'd "time" named you one of the 100 most influential people? >> i was completely surprised. that came at me out of the blue. yeah. >> that's a pretty heady group. you're in with charlie rose and pope francis. >> yeah, i know. pretty interesting. now is a good time to get the ball rolling. medicare only covers about eighty percent of part b medical costs. the rest is up to you. that's where aarp medicare supplement insurance plans insured by unitedhealthcare insurance company come in. like all standardized medicare

proceed but i do think the first step is to have that conversation. >> emanuel charpontier and jennifer doudna. >> reporter: the high hopes and high stakes associated with crispr have catapulted doudna into a rare stratum of scientific celebrities. last year she and her research partner received the$3 million breakthrough prize in life sciences, which seems to be only the beginning. >> your name has been floated repeatedly for the winner of the nobel prize in science. >> i'm just incredibly honored and shocked to see that. i don't honestly think much about it. >> why you surprise when'd "time" named you one of the 100 >> i was completely surprised. that came at me out of the blue. yeah. >> that's a pretty heady group. you're in with charlie rose and pope francis. >> yeah, i know. pretty interesting. it was a fun party. this happen to you. if you or a loved one is suicidal, no matter how hopeless or helpless you feel, with the right help, you can get well. (franklin d. roosevelt) the inherent right to work is one of the elemental privileges of a free people. endowed, as our nation is, with abun

proceed but i do think the first step is to have that conversation. >> emanuel charpontier and jennifer doudna. >> reporter: the high hopes and high stakes associated with crispr have catapulted doudna into a rare stratum of scientific celebrities. last year she and her research partner received the$3 million sciences, which seems to be only the beginning. >> your name has been floated repeatedly for the winner of the nobel prize in science. >> i'm just incredibly honored and shocked to see that.t. i don't honestly think much about it. >> why you surprise when'd "time" named you one of the 100 most influential people? >> i was completely surprised. that came at me out of the blue. yeah. >> that's a pretty heady group. you're in with charlie rose and pope francis. >>>>eah, i know. pretty interesting. it was a fun party. >>> the cbs overnight news will be right back. when the engines failed on the plane i was flying, i knew what to do to save my passengers. i didn't know how to help him. when he ultimatete shot himself, heheeft our family devastated. don't let this happen to you. if you or a lov