For example, at one point in the book, I write that the notion that creativity and originality are synonymous did not emerge until the late eighteenth century. When I write a broad statement like that, I’m positive it’s true. And then Emily comes upon it and checks my citations to see how I back it up. If there’s no citation, and she isn’t convinced, she’ll leave a note that amounts to “How do you know?” Gulp. I just know! I read it someplace! Many places! After five minutes of protesting in my own mind, I get to work figuring out if I actually have credible sources.