January 29, 1987, the first day of the first lunar month) (Dingmao years, Chinese-American scientist Paul Chu announced that for the first time more than 90K superconductors. In January 1987, the Chinese-American scientist Paul Chu et al announced that for the first time more than 90K superconductors, which is the first human breakthrough liquid nitrogen temperature (77K) superconductors, Superconductivity in the history of another milestone.