Mean Temp 9°C 48.2°F at Taegu
April 20, 1950 (Thursday)
- U.S. Director of Central Intelligence Roscoe H. Hillenkoetter authorized the CIA to begin Project BLUEBIRD, with the objective of mind control research, summarized as discovering methods of "conditioning personnel to prevent unauthorized extraction of information", "control of an individual by the application of special interrogation techniques", "memory enhancement" and "preventing hostile control of Agency personnel".
- The American freighter California Bear collided with the Chinese ship Sinan off of Taku sandbar in the Yellow Sea, with 70 Chinese sailors drowning when the ship went down.
- Born: Steve Erickson, American novelist, in Santa Monica, California