I'm Michel Martin and this is TELL ME MORE from NPR News. We are going to talk a bit today about people on the move. Around the world and throughout time, people have moved from one place to another in search of better lives. But how they're doing it and how much they're doing it are changing. Coming up, we'll look at how thousands of Central Americans are trying to pass through Mexico to the U.S. border every year by clinging to the tops of rusty cargo trains.
I'm Michel Martin and this is TELL ME MORE from NPR News. Coming up, it's no secret that it's getting harder to move on up in this country, to achieve upward mobility that is. Last week, we asked whether the ability of Americans to literally move to different parts of the country is playing a role in this. We heard from so many listeners about this that we decided to dig into the story a bit more, and we'll have that in just a few minutes.