On this day, 124 years ago, on March 31, 1901 (February 12, 1901 in the lunar calendar), military engineer Xu Jianyin was killed and injured in the explosion. Xu Jianyin is like On March 31, 1901, military engineer Xu Jianyin was killed while trial-producing gunpowder in Hanyang, Hubei Province. Xu Jianyin, born in 1845, is the son of Xu Shou, a famous modern scientist. He is the author of "A Complete Book of Shipbuilding" and "New Book of Art of War".