An old foreign lady came to China. She found some children in China and asked them to play a game. She put some small balls tied with thin thread into a bottle. The mouth of the bottle is so small that only one ball can pass through at a time.

She said: "This is a fire scene, and everyone can only survive if they escape from the bottle."

She asked each child to take a thin thread, and time began. I saw several children take out the ball in turn from small to large.

The old lady was surprised. She has done this experiment in many countries, but none of them succeeded. Without exception, the children scrambled to pull up the thin thread desperately, and finally a pile of balls blocked the bottle mouth. ...

This is the power of cooperation!