What makes man, man and an ape an ape? According to Richard Wrangham it is not one's ability to fashion tool, but rather the ability to cook. He is the author of Catching Fire, How Cooking Made Us Human. The Sterns are in LA eating a French Dip at its origin, Philippe's French Dip Restaurant, and there is a new movement sweeping across America group canning sessions.
Broadcast dates for this episode:

• September 26, 2009 (originally aired)
• September 11, 2010 (rebroadcast)