this is the eldest sister, seul. she works in the ear, nose and throat department. enjoyed caring for people, so when she was in high school, she decided to become a nurse. the second eldest, seol, works in the artificial kidney department. she cares for patients undergoing dialysis. when she was a child, she was treated kindly by her nurses, and decided to be a nurse herself. the youngest sister, mil, works in a newborn nursery. at first, mil wanted to be a physical education teacher, but knowing that her eldest sisters wanted to become nurses, she decided to join them. the second eldest, seol, has returned home. the other sisters cook dinner for the tired seol. today's main dish is dokboki, rice cake made with sweet and spicy sauce. at 6:00 a.m., sol and mil leave for the hospital together. the day of daon's discharge has arrived. daon now weighs 2,020 grams. it's time to say good-bye. the baby is healthy and her parents are overjoyed at being with her. this is when sol feels happiest. the four sisters take a day off together, the first in a long while. they retur

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mannou taodt ches a h ♪ yoy seul ches ♪ a h trdese ♪ ♪ mama said there'd be days like this ♪ ♪ "there'llle announcer ] the toughest job on the planet just got a little easier. with one touch technology and even an air scrubber. the nissan quest. innovation for family. innovation for all. get up to $3,050 total savings on the 2011 nissan quest. ♪ >>> okay. check out these numbers. tomorrow will be debate number nine. all eight major gop candidates will be there. and it's only about the number one issue -- the economy. your money your vote will air at 8:00 p.m. eastern time on cnbc. and their chief washington stoernt our friend john harwood one of the moderators and he joins me from michigan. what will we see? how will this be different than the other eight? >> chris, incredible focus on the economy. clearly the herman cain scandal has dominated the republican race in the last few days. we can't ignore big news in the race, but we've seen from our new nbc/"wall street journal" poll american people remain deepry troubleed by the state of the economy. they want answers and we'll go in real d