Huang Zengxin, a science and technology teacher, has achieved a new phenomenon in Shanghai's education field: under his guidance, the students of this school have almost won the highest prizes in various national youth innovation competitions. In the past three years, more than 200 students have obtained nearly 400 patents, and he is known as the "magic coach" of students' scientific and technological innovation activities. People from universities, middle schools, creative societies and other fields discussed in Xiangming Middle School. "Mr. Huang has a set of methods to guide students to choose questions," said Lu, director of the Physics Department of Fudan University. He summarized some tips for students to choose topics: try to choose social hot topics such as environmental protection, energy saving and medical care, and pay attention to social needs. A student happened to find that hospitals often use salt to treat patients, and the dosage must be strictly controlled, but hospitals lack instruments to weigh salt. As a result, the student creatively designed several portable miniature scales, which were well received by experts in the innovation competition.