Chemical warfare refers to using chemicals as a weapon of mass destruction, killing many people at once. Fritz Haber, the inventor of the ammonia extraction process, is also the father of modern chemical warfare.
On Jan. 31, 1915, Germany used a type of tear gas on allied troops. Due to the temperature, the chemicals failed to vaporize.
On Apr. 22, 1915, Germans launched 168 tons of chlorine towards allied positions, killing about 6,000 people and blinding more. Fritz Haber, the scientist personally supervised the release of the chlorine.
Haber’s first wife committed suicide after realizing his role in the countless deaths in WWI.
Haber, who was Jewish but tried converting to Christianity, also invented Zyklon A. That is the poison that would evolve into Zyklon B, used during the Holocaust to murder Haber’s extended family.
Towards the end of his life, the Nazis turned on Haber due to his Jewish origin. After locking him out of his lab, Haber fled Germany and died, soon after, in 1934.