Three men have lunch together. But when the lunch is over, the men don't agree on who should pay for the food. So, like little boys, they play a game called rock-paper-scissors. People sometimes play this fun game when they have to 1 something or someone but they have no idea about how to make the decision.

    In this game, a 2 hand means a rock, an open hand means a piece of paper, and a hand with two fingers out means scissors. We all know 3 this is played. Paper can cover a rock, so rock loses to 4; scissors will break if they try to cut a rock, so scissors lose to rock; and scissors can cut paper, so paper loses to scissors.

    It seems that everyone 5 this game, but many people do not know where it came from.

    People first started playing a game6 rock-paper-scissors in ancient China. During the Han Dynasty, people played a game called shoushiling (手势令）.In this 7, people used hand gestures like those in today's game. 8 their gestures meant different kinds of animals. The modern form of rock-paper-scissors was 9 in Japan.

    Today, this game has 10 become popular around the world. Scientists are even studying it to find out its secrets.