Many good questions on this quiz, well done. The volcano surprised me, cool fact to learn. I also answered counterintuitively on the boardwalk question but it turned out to be true. Perhaps number 9 and 13 are a bit specific. Maybe take a longer period for 9 and a statement that is more clearly the opposite of what happened (for example, a large increase when there was actually a decrease, or vice versa)? And since this happened to me on one of my own quizzes, most users and Quizmaster prefer it when the True-False order is not randomized.