How to make folding fans by hand?

1. Stick the prepared notes on square red paper in turn.

2. Draw watermelon seeds on red paper with a black marker. Divide the colored paper equally and fold it in half to form the following picture.

3. Make another one in the same way and stick the two together.

4. Finally, stick disposable chopsticks on both sides to make a folded watermelon fan.

How to maximize the fan wind;

1. The surface area of the fan increases, so it encounters more air.

2, improve the fan speed, this is the principle of electric fans, the same surface area, why 1 and 3 wind is different? It is caused by the different power of electric fans.

3, reduce the temperature of the air, the wind is the most "big", what is big, in fact, in essence, is to make the wind fan out the most comfortable.