Have you read it cover to cover? If so, it’s time to test your memory. The quiz below contains 20 surprising facts, each one drawn from a different article in our latest issue. Each question includes the page number where you can find the answer, so if you’ve got a copy of the magazine handy, you can follow along on paper. Otherwise, go to the online table of contents, where the articles are listed in the same order as they appear in the quiz.