barro colorado island, an ecological preserve created through the making of the panama canal, stuart davies hopes to uncover somef the mysteries of a complex ecosystem -- the rainforest. man: i'm the director of the center for tropical forest science, which is a group who study the rainforests of the world. and we work together as one very large network to try to understand how rainforests function and how they're gonna change in the future. narrator: tropical rainforests are believed to be the oldest terrestrial ecosystems on earth. they are home to over 5 million known species of plants, animals, and insects, with millions more yet to be discovered. and trees play an essential role in the diversity of these intricate ecosystems. dr. davies: one famous ecologist said trees in tropical rainforests are like -- he called them the ecosystem engineers. what he meant by that is that they provide the habitat on which all these other organisms depend. so monkeys that live up in canopies of trees go extinct if you take the trees away. ants and termites -- they're gonna be absent if the trees disapp

stuart: thank you. >> it took you a long time to come up with the name of it? the seth davis show. on television and the people do not see it when it is on the air. they will never see it again. stuart: have you any idea of the value of the commercial that i just allowed you to deliver? >> that is why i got up early this morning. do not lose your accent. your television career will be over. stuart: thank you very much. [laughter] stuart: john wayne. that was great. thank you. they call themselves the helpful union guys. ten of them arrested. ten union leaders arrested. details coming up with the dow of 33. ♪ [ male announcer ] this is karen and jeremiah. they don't know it yet, but they're gonna fall in ve, get married, have a couple of kids, [ childrenaughing ] move to the country, and live a long, happy life together where they almost never ght about money. [ dog barks ] because right after they get married, they'll find some financial folks who will talk to them about preparing early for retirent and be able to focus on other things, like each other, which isn't rocket science.