DS broke the science center guy with "what happens to the cells in an apple when it gets bruised?"

I'm not sure if I'm more amused by the stumbling goofy answer (that particular guy is one of the stand-out-from-the-crowd awesome guys there, seeing him miss a beat either in clowning OR in science fact is... rare) or by the fact that DS managed to actually go up to the guy, wait his turn, and then ask a question.

I love our science center.

DS1: Hon, you already finished your homework
DS2: Quit it with the protesting already!