Stephanie Kwolek was a woman inventor, which she found a happy accident of science, that proved to be more monumental than others. She was working at DuPont for a synthetic fiber to use for tires. Instead she made a mistake by noticing one mixture of a polymer, and a solvent, that looks different from the rest. She got curious and made a follow-up on her  observation. Her formula turned into fiber, which is now stronger than steel. She called it Kevlar. It is now used for bulletproof vests, and body armors to save lives. She died on June 18, 2014. She was 90 years old. R.I.P. Stephanie Kwolek