This lab is another student favorite. Again, toys grab the attention of your students and keep them focused! Why not use them? You can usually find very inexpensive dart guns at your local superstore ($1-$4 each). I would not recommend purchasing the very powerful and expensive dart guns because you know that your students will eventually wear them out, and that can make for an expensive equipment replacement! The inexpensive dart guns work great and give you wonderful results that students always remember. A hint: I usually give each group ONE dart. I’ve found that if you give each lab group multiple darts, they somehow disappear like socks in the dryer.