tucked away on 1,200 acres of land that seem part serengeti, part high-tech medical facility, she and at the audubon nature institute have been working quietly for years on the science and the art of inter- species cloning. and she'll be the first to tell you that, even with living animals, it isn't easy. >> betsy dresser: you don't just clone some cells, and then all of a sudden you have a baby. i mean, there's so many scientific steps along the way-- knowing everything from hormones to the proper surrogate to, you know, length of pregnancy. >> stahl: length of pregnancy? >> dresser: yeah. because, see, we don't know how long a woolly mammoth-- the gestation period. we can guess, but we don't know, really. >> stahl: but betsy dresser's work on inter-species cloning is focused on the future, not the past. rather than trying to resurrect extinct creatures, her goal is to keep the animals we have today from going extinct tomorrow. >> dresser: i feel like we're in the emergency room of the wildlife business, really. i don't want to see elephants in textbooks or, you know, the way we see

at the steering dade -- serengeti gallery and one of our contributors set that up and it was a brilliant affair. we want you to know the network is working and it has changed our lives and there are people that we love we have a person who is sitting in the front row her name is betty and her husband adam. she had no idea i would mention this but all throughout she lives right down the corridor of where the obama inauguration parade would be going or moving in we were invited to come to her house to overlook the balcony. so daily we were getting photographs we're still in the process of putting up of everything that was happening along the parade route, who was going to be where and what the street looked like. it was absolutely fantastic that this network was keeping us informed as a lever in our pajamas trying to put the book together and the seal the deal. it has been absolutely extraordinary and what we want to talk about is how is this booktv looked at? people who are african-american studies and who are in american studies and causal studies and women's studies, a sociology, a femi