Sometimes it doesn't matter how excited you are about your lesson plan, it can still fail epically. I was so excited to do the following lesson that I wasn't prepared for the students to not respond how I had planned. Here is the Thingiverse Lesson that I was doing - http://www.thingiverse.com/thing:2168954.
I didn't realize that I needed to explain that shooting the spheres at each other wasn't part of the investigation. I didn't realize that I needed to constantly remind the team that only one person could be connected to the Dash for launching. I really didn't need to tell them these things..... but it clearly showed me that continuing this lesson at this time would not result in positive learning.