On this day, 38 years ago, February 20, 1987 (January 23, 1987, the lunar calendar), China made a major breakthrough in superconductor research. On February 20, 1987, 13 researchers including Zhao Zhongxian from the Institute of Physics, China Academy of Sciences discovered for the first time superconductors with an initial transition temperature above 100K (K is absolute temperature, 0K is-273 ° C, and 100K is-173 ° C), making our country once again a world leader in the field of low-temperature superconducting materials.