Template:Selected anniversaries/June 23
1390: Priest, philosopher, physicist, and theologian John Cantius born. He will help develop Jean Buridan's theory of impetus, anticipating the work of Galileo and Newton.
1912: Computer scientist, mathematician, logician, cryptanalyst and theoretical biologist Alan Turing born. He will be influential in the development of theoretical computer science, providing a formalization of the concepts of algorithm and computation with the Turing machine.
1959: Convicted Manhattan Project spy Klaus Fuchs is released after only nine years in prison and allowed to emigrate to Dresden, East Germany where he resumes a scientific career.
1972: Watergate scandal: U.S. President Richard M. Nixon and White House Chief of Staff H. R. Haldeman are taped talking about using the Central Intelligence Agency to obstruct the Federal Bureau of Investigation's investigation into the Watergate break-ins.