Back in 1920s California, Joan McCarroll was cruising down a skinny two-lane road when a speeding truck almost pancaked her. She swerved, wound up in the sand, and thought, “What if we just painted a stripe down the middle so everyone stays in their own lane?” Officials laughed. Joan didn’t. She grabbed a bucket of white paint and DIY’d the first divider herself. Seven years of door-knocking later, California made it law in 1924—crashes plummeted. That simple stripe rolled out worldwide and has been saving lives ever since. #FunFact #FemaleActionHeroStyle