Hi, I recently just take over Robotic Club of my school and doing some inventory checking. I found out there are RCX Sets and NXT 9648, 9695, 9797. Inside these kit I found some parts that I have no idea what can I do with them. Can someone be kind enough to tell me what are these part and where can I use these, since I and collecting some mechanism examples for my students to learn. Thanks a lot.