Ask questions you can’t answer — These questions are different from those you don’t know the answer to. It’s possible to find answers to those questions. These are the questions currently being confronted within the field or area of study that haven’t yet been answered. As of this moment, the answers are unknown. A question that can’t be answered is inherently more interesting than one that can be answered. Are there theories or research findings that suggest answers? Are some of those more likely than others? Could the answer be something totally unexpected? What if a student thinks she might have an idea about a possible answer?
Allen, D. and Tanner, K. (2002). Approaches to cell biology teaching: Questions about questions. Cell Biology Education, 1, 63-67.