When we take the pen casing is shaped as a cylinder and comes at the end of the potato filling open both side by side in the air. When we brought chopsticks to push the rear end of the casing of a pen and finger the other fillings. The inside of the casing will cause air pressure with oxygen gas as a reactant to cause contraction of gas oxygen until the internal pressure occurs, but when we release the finger pressure currently filling the air pressure will be changed to overcome the friction between the potatoes and his pen. Make the potato to spout out forward speeds.
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