Today, I saw a pesticide seller in the street with a plate beside it. There was sand on the plate, and my finger jumped on the sand. What happened?

In society, we often see some skills that are not understood by ordinary people, which are used to impress people and achieve the purpose of cheating some money. Those who were exposed were beggars with disabilities, chess players, sellers of counterfeit drugs, money changers, fortune tellers ... nothing more than cheating money. What you see is just the tricks he has mastered. You don't need to understand them. Be careful not to be cheated.