The history of kites can be traced back to the Spring and Autumn Period in China. At that time, people mainly relied on bamboo to make kites. After the four great inventions of papermaking in China appeared, kites began to make kites out of paper, which was called paper kites at that time.

The reason why kites can fly to the sky is the crystallization of the wisdom of ancient working people. In the process of flying kites, you need to use the traction line on the ground. In the case of headwind, the air around the kite can flow faster, the pressure on the kite will gradually decrease, and the kite will gain strong lift. This powerful lift can overcome its own gravity, and kites can fly in the air. Some weights will be added to the tail of the kite, which can balance the position between the center of lift and the center of gravity and prevent the kite from tumbling and stalling in the air. The reason why kites can fly to the sky is based on Bernoulli's law and the principle of balance. In a fluid system, the faster the fluid flows, the smaller the pressure will be, and the greater the pressure will be.

In addition to kite accidents, humans also sent planes into the sky according to Bernoulli's law. During take-off, the flow velocity under the wing will be lower than that above. According to Bernoulli's law, the pressure above the wing will be greater than that below, so lift will be generated. With the acceleration of the speed of the plane during take-off, the lift will be bigger and bigger, and finally the plane will be sent to the sky.

At the National Kite Festival in Weifang, all kinds of kites flew into the sky, which added fun to this year's International Kite Festival. At this International Kite Festival, people made kites in the style of aircraft carrier, kites in the style of Kweichow Moutai, kites that can fly in the air by bike, and various dragon-shaped kites were also sent to the sky. I really lamented the wisdom of the working people in China, who sent their ideas and kites into the sky. I also hope everyone can attend Weifang International Kite Festival.