all of the animals... >> stahl: so, everything... >> dresser: ...that people know in zoos. >> stahl:om this size to this size. >> dresser: to this size, exactly. >> stahl: so, how long can a piece of skin be viable? >> dresser: we think these cells can sit here for hundreds, maybe thousands of years. >> stahl: so if any one of these animals were to go extinct, you could bring them back? >> dresser: in theory, i believe we can. >> stahl: in other words, it's kind of a noah's ark. >> dresser: yeah. >> stahl: it's not a zoo, it's an ark. >> dresser: it's an ark. ( chuckles ) truly. >> stahl: do you think we're at the stage where we should be taking every single wild animal, even if they're not endangered, and putting them in a frozen zoo? >> dresser: yes. i absolutely do. >> stahl: every single one? >> dresser: what have we got to lose? i think we should put every species in that we can, while we have the opportunity. >> stahl: which raises the question, with so many living animals today threatened, why think about resurrecting extinct ones, like the mammoth? to bring the woolly mammoth

richard sharpe: oh, yeah. >> stahl: dr.gh, scotland, one of the leading phthalate researchers in the world, exposed pregnant rats like these to phthalates, and produced a string of abnormalities in their male offspring. >> sharpe: we see undescended testes. we see this penis abnormality, hypospadias. we see smaller testes in adulthood, which means lower sperm counts. >> stahl: so by giving pregnant rats phthalates, you're inducing some of the same problems that human males are having and that you're seeing. >> sharpe: yes. >> stahl: there have been hundreds of studies on rats, with similar findings. >> sharpe: we come to the marmosets here. >> stahl: but when dr. sharpe tried the same experiment on animals much closer to humans than rats-- monkeys-- he got an entirely different response. he tested phthalates on pregnant marmoset monkeys like these. and their offspring? completely normal. >> stahl: none of those same effects that you're seeing with humans, or that you saw with the rats? >> sharpe: none at all. >> stahl: if s

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scombroorn stahl gets it back. what is the difference between the penguins' power play and the capitals' ineffective power play against this team? >> first of all they had structure. i think a lot of it was because montreal was tired, unable to get through and back to where they were. and pittsburgh outworked the penalty kill where washington didn't >> look how sid crosby kept that lie -- play alive for cris letang. goligoski beats halak. the final with crosby getting two assists and mario lemieux happy. pittsburgh wins 6-3. you mentioned montreal tired, pittsburgh, six days' rest. it worked for them. >> it did especially on the power play. they only gave up, montreal, one power play goal in seven games. the best in the league. tonight they looked like a very fatigued group and pittsburgh took advantage of it. they were the better team, they deserved it. montreal will respond and be much better in game two. >> still not a lot of time to recover. game two is sunday afternoon in pittsburgh. thanks, matthew. >> thank