On today's show, IDEO's Dav Rauch and Peter Hyer talk about their work designing the interfaces in everything from ATMs to Tony Stark's Iron Man suit. It turns out that thinking about how people use stuff is a pretty fun job, full of insights into the quirks of human behavior, even--or especially--when you get to try things like using beach balls to compose music, or a burrito as a video game menu.

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