Just thought that it'd be nice if there were explanations in the answer keys, telling why the answer to a question is that answer. Like, for example, why the code needs to be that specific way or if it's a question of what out of these four is the correct thing to put in the code, it would explain why and would quickly go over (in a sentence or two.) what that specific thing does. In my opinion, it would greatly help the quiz taker understand more about the code and that specific lesson. Any thoughts?