A professor entered the classroom and asked his students to prepare for a surprise exam. They all waited anxiously at their desks for the exam to begin. The professor handed out the exam with the text face down as he usually did. Once all the exams were handed out, he asked his students to turn the exam over. To everyone’s surprise, there were no questions-just a single black dot in the middle of the otherwise blank piece of paper. The teacher seeing the expressions on h