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The original was posted on /r/todayilearned by /u/Usernameistakenndamn on 2023-07-11 02:27:56+00:00.

Original Title: TIL that in WW2 the Japanese had a secret bio-warfare research unit called Unit 731 that performed lethal human experimentation, including infecting captives with the plague, STDs, performing vivisections without anesthesia and more. An estimated 200k - 300k people were brutally murdered.