Thousands of police officers and soldiers who were saved by a bulletproof vest owe their lives to a Delaware woman named Stephanie Kwolek. Kwolek, who died Wednesday, was a DuPont Co. chemist who in 1965 invented Kevlar, the lightweight, stronger-than-steel fiber used in bulletproof vests and other body armor around the world. Going against the all-male grain, she was a pioneer who "leaves a wonderful legacy of thousands of lives saved and countless injuries prevented by products made possible by her discovery," says the DuPont CEO, Ellen Kullman
