I encourage the questions (and have had some really cool ones, like why don't we have two suns, or where did the first person come from) but yes, especially young kids ask questions because they want to hear you talk, and often they are the same one over and over, or don't make sense, or are asked to delay something else. I mostly only answer the exciting well thought out questions and encourage them to try harder if it's not a good question (for their age).