Goodreads asked David Bodanis:

Where did you get the idea for your most recent book?

David Bodanis I've always been fascinated by Einstein, and knew there was more to say about him than I did in my old 'E=mc2', where he only had a passing role. But I couldn't see how to focus it! Then I realized: focus on his greatest mistake, and everything falls into place. Once that became clear, the writing - at least the first draft - was a dream: as easy as any work I've done. (The editing took much longer than the first draft!)

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