There were two people in ancient China. Tao Hongjing and Shen Kuo. During the Qi and Liang Dynasties in the Southern Dynasty, Tao Hongjing was knowledgeable and proficient in astronomy and calendar, mountains and rivers geography, medicine, chess, music, calligraphy and painting, and even Yin and Yang and the Five Elements. He made certain contributions in many aspects of ancient science and technology such as medicine, alchemy, astronomy, geography, biology, mathematics, etc. Shen Kuo, politician and scientist in the Northern Song Dynasty. In the history of Chinese science and technology, Shen Kuo is one of the most versatile figures.