An Alien's Guide to Earth
This somewhat rambling and popular-talk-show style podcast/radio program has, at its core, a great interview between Neil Degrasse Tyson and Jon Stewart about The Daily Show's newest book "Earth: The Book."
If you can stomach the talk-show banter (honestly, I wouldn't have made it through if the interview was even one notch less interesting) and the ads (virtuous ads, but still ads), this interview illustrates why I adore Jon Stewart. He really speaks about the things I think about. You know that conversation-starter question about "what famous persons would you most like to invite to dinner?" He's at the top of my list.