Here in auto-saturated Los Angeles, the bumper sticker has always been a healthy form of self-expression. But in recent years, they’ve become far weirder than your average tourist-trap souvenir ...

Ancient Greek letter and math symbol pi. Credit: Shisma/Wikimedia Commons/ CC BY 4.0 Math fanatics worldwide and everyone else who just loves pi (or pie) celebrate Pi Day on March 14. Pi was named for ...