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A paper airplane's beak, or the front side of the airplane, helps it go through air more easily. This is called 'aerodynamics'. Aerodynamics is the study of forces and the resulting motion of the objects through the air. Air is not empty space, but instead it is filled with stuff! This stuff can push against the airplane and cause drag, which slows it down. By having a pointy 'beak', the airplane can cut through the air particles with the least amount of drag and resistance!