PA-born DuPont scientist, Stephanie Kwolek, has died aged 90. She invented the super-strong, lightweight Kevlar fibre now used across the world in bullet-proof vests and body armor. '....she said she was afraid to tell her managers and conducted repeated tests just to make sure. "I didn't want to be embarrassed. When I did tell management, they didn't fool around. They immediately assigned a whole group to work on different aspects," she said.' http://www.theguardian.com/world/2014/jun/21/stephanie-kwolek-inventor-kevlar-dies Rest in peace Stephanie Kwolek.