▽Freakonomics Blog ●01/05 02:07 How to Have Good IdeasSarah Stein Greenberg runs Stanford’s d.school, which teaches design as a mode of problem solving. She and Steve talk about what makes her field different from other academic disciplines, how to approach hard problems, and why brainstorms are so annoying.Pistachios (Replay)How did a little green nut become a billion-dollar product, lauded by celebrities in Super Bowl ads?