This is a bottle rocket that one of the second grade teams built as part of our co-teaching conference.  We had to cooperatively work as a team to design and interpret directions to create our rockets, and then we launched them.   We also worked together to design a lesson plan to cooperatively teach two different Math lessons.  One second grade team planned and delivered a lesson on telling time, and the other team planned and delivered a lesson on making change.  One day we cooperatively worked together to build a marshmallow catapult.  This is a lesson that I want to modify for a second grade class to use when we do the unit on simple machines.