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Unit 731: the secret military unit of the Imperial Japanese Army that conducted some of the most horrific human experiments in modern history during the 1930s and World War II. ⚠️ This article is a grim reminder of human depravity: VIEWER DISCRETION ADVISED ⚠️ What it was Unit 731 was based primarily in Harbin, in Japanese-occupied China.  Officially, it was presented as a public health and water purification department, but in reality it was a covert biological and chemical warfare research program. It was led by Shirō Ishii, a military doctor who played a central role in developing Japan’s biological weapons program. What they did Unit 731 carried out brutal experiments on thousands of people—mostly Chinese civilians, but also Koreans, Russians, and some Allied prisoners of war. Victims were often referred to as “logs” to dehumanize them. Some of the atrocities included: • Vivisection (surgery on living people without anesthesia) • Deliberate infection with diseases like plague,...