You've probably heard the saying "no is a complete sentence." For Justine Musk, that wasn't just a self-help mantra — it was the defining trait she noticed in her college-sweetheart-turned husband, Elon Musk.
Long before he became the richest man in the world, she was by his side, raising five children with him and watching up close as he carved his path with relentless work and a refusal to be pulled off course. Years later, in a 2014 TEDx talk, she put that observation into words:
