dr. fraser and dr. cohn will tell the story of the wright brothers. people tried to fly imitating nature, it never worked. the same thing with the article heart of the it was never going to work as well as it should if you try to copy the beating of the regular heart. that's why these worked transcending nature. >> and after he put it in craig, his wife says i don't hear anything, there's no beat. but he's alive. >> you hear a whiring sound and again, she was sort of like, well, does he love me or not? is it really him still? one of the interesting stories about the left ventricle device, which is a small sort of-- it's called an art heart, but it helps just the left side. you see people walking around with what looked like backpacks and it just happened that someone will be too far away to plug themself back in or someone was in europe and a guy came back into moto and thought he was snatching is purse and snatched a battery pack so that's why you want an implantable device. so-- >> i want to bring up one of the sort of questions at the center of the