we begin with joseph nye the former dean of the kennedy school at harvard. his new book is called "is the american century over?" >> the americans are in better shape than people realize. demographically, we're the only rich country that is going to keep its position in the world. if you look at the population of countries today, china is number one, india number two america number three. 2050, the u.n. demographers project india number one china number two but the u.s. still number 3. the interesting thing about that, we are the only rich country that will be able to maintain its standing and that's because we're a nation of immigrants. we accept immigration, and that is going to keep us essentially a country which instead of with a small working population sporting a large old population we're going to have a pretty balanced population. >> rose: we conclude with jeffrey sachs the author of "endeavour." >> so this has been a good overall for reducing poverty but the reason we're facing the need for new goals right now is many other things are really startin