20th Century Human Experimentation By chrisliu1999 Jan 1, 1900 Start of Timeline Period: Jul 7, 1937 to Sep 9, 1945 Unit 731 Unit 731 ranged from 1937 to 1945 Period: Jan 1, 1939 to May 7, 1945 Nazi Human Experiments Nazi Human Experiments ranged from 1939 to 1945 Period: Jan 1, 1940 to Jul 31, 1955 Lobotomy Lobotomy was popular from the 1940s to mid 1950s Period: Jan 1, 1950 to Dec 17, 1973 Project MKUltra From the early 1950s to 1973 Dec 31, 1999 End of timeline