Also occurring on Pi Day (a strictly American celebration since we do our dates backwards from the rest of the world),

Eli Whitney patents the cotton gin (1794), Charles Darwin set sail aboard the Beagle (1836), California legislature approves Golden Gate Park measure (1870), San Francisco’s Sutro Baths open (1896), RIAA certifies 1st gold record, Perry Como’s Catch A Falling Star (1958), Linux version 1.0.0 is released (1996), The first World Maths Day was celebrated (2007).