Template:Selected anniversaries/April 1
1776: Mathematician, physicist, and philosopher Sophie Germain born. Germain's work on Fermat's Last Theorem will provide a foundation for mathematicians exploring the subject for hundreds of years after.
1891: Inventor and crime-fighter Herman Hollerith uses his punched card analyzer to track down and delete the criminal artificial intelligence Killer Poke.
1898: Mathematician and anthropologist William James Sidis born. Sidis will become famous first for his precocity and later for his eccentricity and withdrawal from public life.
1972: Computer scientist, engineer, and APTO field engineer John Argyris visits the Nested Radical coffeehouse in New Minneapolis, Canada, where he gives an impromptu lecture on applications of the finite element method in Gnomon algorithm research.
1973: Mathematician Robin Farquharson dies. Farquharson wrote an influential analysis of voting systems in his doctoral thesis, later published as Theory of Voting.
1974: Mathematician and crime-fighter Yael Dowker uses measure theory, ergodic theory, and topological dynamics to detect and prevent crimes against mathematical constants.
2003: Steve Bellovin publishes Request for Comment 5314, subsequently known as the evil bit protocol, a humorous April Fool's Day proposal.
2004: After collecting solar wind particles for 850 days, the Genesis ends its collection process. The Genesis return capsule will crash land in Utah on September 8, 2004, after a design flaw prevents the deployment of its drogue parachute.
2016: Chromatographic analysis of Eye Foot reveals "at leave five hundred and twelve" previously unknown shades of gray.
2016: Mathematician Tan Lei dies. Tan Lei specialized in complex dynamics and functions of complex numbers, making contributions to the study of the Mandelbrot set and Julia set.
2018: Math photographer Cantor Parabola attends Minicon 53, taking a series of photographs with temporal superimpositions from Minicons 52 and 54.