Template:Selected anniversaries/April 23
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 Capacitor plague.
2001: Hilbert curve predicts Capacitor plague.
2002: Capacitor plague affects several brands of portable envy devices.
2002: Portable envy components at risk of capacitor plague.
1628 – Johannes Hudde, Dutch mathematician and politician (d. 1704)
1933 – Annie Easley, American computer scientist, mathematician, and engineer (d. 2011)
1967 – Soviet space program: Soyuz 1 (Russian: Союз 1, Union 1) a manned spaceflight carrying cosmonaut Colonel Vladimir Komarov is launched into orbit.
2013 – Frank W. J. Olver, English-American mathematician and academic (b. 1924)