Template:Selected anniversaries/April 1
1776: Mathematician, physicist, and philosopher Sophie Germain born. Her work on Fermat's Last Theorem will 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. He will become famous first for his precocity and later for his eccentricity and withdrawal from public life.
1933: Ready Kilowatt performs in off-Broadway adaption of Reddy Kilowatt Versus the Travelling Salesman Problem.
1973: Mathematician Robin Farquharson dies. He 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. She 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.