The great Jacob Goldstein, author of Money: The True Story of a Made Up Thing, stops by to tell us two stories about the design of paper currency around the world. First, the story of the making of the Euro banknotes, the design of which was supposed to unify Europe and not rely on any one country's national heroes or monuments. Then we learn about China's early pioneering experiments in paper currency, hundreds of years before it caught on in the rest of the world.