Radiolab ｻ The (Multi) Universe(s)
This is a great podcast of a conversation between string theorist Brian Greene and Robert Krulwich of WNYC's Radio Lab, talking about the structure of the universe.
What delighted me about this was that Greene talks about a favorite idea of mine--that if the universe is sufficiently large, in the distant reaches (10 to the 10 to the 29 miles away, at least) there is a planet almost exactly like Earth. My conceit that somewhere, my life is depicted on a TV show could be actually true.
There are plenty of other interesting speculations that Greene puts up, and Krulwich does a good job keeping it at a level which non-scientists can understand.
Definitely worth a listen.