The best thing I heard all day was absolutely Apocalyptical from Radiolab [Dec. 9, 2013, 1 hour, 40 minutes]. It's an old recording of a live performance from the show, and it's one of the most fascinating episodes I've ever heard. Jad, Robert, and a handful of comedians and musicians explore endings of all types, including the extinction of the dinosaur population 65 million years ago. I re-listened to this one for a post that's coming your way tomorrow, and I'm so glad I did. It was just as incredible as I remembered, and it was by far the best thing I heard all day. If you haven't heard this great episode yet, I'd highly recommend checking it out.