Terry Gross

If you've watched cartoons in the past few decades, you probably know Billy West's voice: He's played Philip J. Fry and Zapp Brannigan on Futurama, plus Bugs Bunny and Elmer Fudd in Space Jam (and more). West explains how he comes up with his voices -- and demonstrates a few of his favorites.

Sometimes, a dog or cat just won't do. In Forbidden Creatures, writer Peter Lauger enters the world of animal smuggling and exotic pets. He explains who's breeding pets for home consumers -- and how raising certain species can go horribly wrong.

Wikileaks is a secretive website with no official headquarters and thousands of leaked, untraceable documents. Investigative reporter Philip Shenon explains the history of the site -- and recent developments since the April release of a classified U.S. military video showing a civilian massacre.