Wonder Wall

My little kiddies have been working on their Teacher's College research unit of study.  As a class, we are studying and researching plants.  I let the kids choose which topic they would like to independently research (as long as we have enough books for their topic) and I figured by letting them pick, that's a form of differentiating, right?
The students love their topics and are learning lots of new information, but tons of questions have come up too.  I decided to start having them write down some of their questions and post them on our "Wonder Wall".  This way I'm not bombarded with questions all day long, and they still have a chance to ask those important questions :)  I have an area for personal questions (those having to do with people) and scientific questions.  The kids love it!