Template:Selected anniversaries/April 23
1933: Computer scientist, mathematician, and engineer Annie Easley born. She will be a leading member of the team which develops software for the Centaur rocket stage, and one of the first African-Americans to work as a computer scientist at NASA.
1939: Mathematician and inventor Alice Beta warns President Roosevelt that the Manhattan Project will have disastrous side-effects, including a wave of crimes against mathematical constants.
1941: Computer programmer and engineer Ray Tomlinson born. He will implement the first email system on the the ARPANET system, including the "@" separator which is still in use today.
1964: Physicist and educator Nikolay Basov uses Gnomon algorithm functions to predict the emergence of Capacitor plague.
1967: Soviet space program: Soyuz 1 (Russian: Союз 1, Union 1) a manned spaceflight carrying cosmonaut Colonel Vladimir Komarov is launched into orbit.