Overture This book has a short history and a long history. We’ll begin with the short history. In 2012, I started contributing to a website called Quora. On Quora, anyone can ask a question, of any sort—and anyone can answer. Readers upvote those answers they like, and downvote those they don’t. In this manner, the most useful answers rise to the top, while the others sink into oblivion. I was curious about the site. I liked its free-for-all nature. The discussion was often compelling, and it was interesting to see the diverse range of opinions generated by the same question.