The negative result of the Michelson-Morley experiment which caused the aether theory to be abandoned. It is the basis of Albert Einstein's theory of relativity,
... head of UNICEF (1965-1979) February 11 - Sir Keith Holyoake, New Zealand Prime Minister (1960-1972) February 20 - Alexei Kosygin[?], Premier of the Soviet Union[?] ...