I've only taken one physics class. I'm not too knowledgeable yet in science, but I was hoping someone can help me explain this video to my brother. http://www.youtube.com/watch?v=zqG-TL0WnjE&feature=BFa&list=HL1343828606 I'm assuming he has a battery in one of the wooden blocks that holds the final contraption up. Although it looks very convincing, my brother wants me to build one. Maybe someone could give me a good reason not to waste my time hah. Thank you guys.