All right. Sima Hongxiang, the top senior high school math teacher in China, was admitted to Peking University College Entrance Examination at the age of 16 with a score of 145. For many years, he explained the breakthrough of solving problems in senior three mathematics, and taught students to solve the finale of the college entrance examination with fool's ideas. His teaching ideas were clear and humorous, which broke the boring atmosphere of mathematics in the past and was deeply loved by students.