Arm Wrestle ,  Power match game .

Demonstration effect: two strength quite a classmate, turning the exhibits at the ends of the rotary table, see who can win.
Scientific principle: the ancient Greek scientist had such an eternal Archimedes famously said, "give me a fulcrum and a sufficiently long long pole, I can pry up the earth."This sentence has a strict scientific basis.Two strength quite a classmate, turning the exhibits at the ends of the rotary table, how can easily "overcome" the opponent?This is going to use the principle of leverage.Using this principle, the human has created one after another myth, such as: the construction of the pyramids in Egypt;The construction of China's Great Wall and so on.