It really is rocket science! I built a rocket launcher yesterday I plan to use at childrens summer camp next week. I have to wait for the glue to dry before I try it out, but it is supposed to shoot a 2-Liter plastic coke bottle containing some water about 200 feet straight up into the air. I use object lessons like this to help the kids remember what was taught at camp. I believe I will launch our water rocket and teach about reacting correctly under pressure. Just see how far you can go!