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Stephanie Kwolek, 83, shown in this June 20, 2007 photo taken in Brandywine Hundred, Del., wears regular house gloves made with the Kevlar she invented. Her friend, Rita Vasta, told The Associated Press that Stephanie Kwolek died Wednesday in a Wilmington hospital. at age 90. (AP Photo/The News Journal, Jennifer Corbett)
This undated photo made available by DuPont shows chemist Stephanie Kwolek at the DuPont Labs in Delaware. Kwolek, a pioneer chemist who invented the exceedingly tough fibers widely used in Kevlar body armor, died Friday at the age of 90. Kwolek invented a liquid crystalline solution that could be spun into the fabric now used worldwide in police and military protective equipment. (AP Photo/Courtesy of DuPont)