Necessity isn't always the mother of invention: some of our most important ideas arise out of moments of playful exploration. We talk with Steven Johnson, the author of a new book called "Wonderland," who contends delight and wonder have had a disproportionate impact on our history and point the way to future innovation.
GUEST: Steven Johnson, author of the book and podcast Wonderland and nine other books on creativity and innovative thinking. Host of the PBS series "How We Got to Now."
Here's an episode of the Wonderland podcast about computers: