Si Chen is eighteen years old this year. When he was very young, he showed extraordinary talent in mathematics. He always scored 100 points in the exam. His father discovered his talent, so he started to work in the stock market when he was eight years old. Ten years later, when he saw a stock, he knew whether he should buy it. It was clear at a glance whether it would rise sharply in about three months and how much room there was for growth.