tavis: good evening from los angeles. i'm tavis smiley. over the next 40 years the population of the united states is expected to grow by 100 million. while many view that as cause for concern, a thought-provoking new book says the change will actually be beneficial. first up, a conversation about that with note the author and futurist joel kotkin. his book is called "the next hundred million." also the legendary producer and director garry marshall stops by, the director behind seminal shows such as "pretty woman" and "happy days" stops by. wire glad you've joined us. announcer: there are so many things that wal-mart is looking forward to doing like helping people live better but mostly we're looking forward to building stronger relationships because with your help the best