This question doesn't show much thought on the part of the writer. I've noticed that I always break out in new pimples just before a big event like my cousin's wedding or my piano recital. Here, the person asking the question has clearly given some thought to the subject and has already made some observations. Plus, most kids can identify with the situation in the question, increasing its interest quotient. Stick to Wendell's topic of the week.
All topics are broad enough to encourage a very wide range of questions.
Consider Ask Wendell a collaborative activity, and have students work in groups to come up with several interesting questions. Then, as a whole class, select two or three of the best questions from all the groups to send to Wendell. Encourage students to send questions often and check back for responses, but remember that Wendell can't reply individually to every question he receives. A selection of responses to his questions will appear online.