Stephanie L. Kwolek, the DuPont chemist who invented Kevlar, died...

2014-06-30T00:00:00

Stephanie L. Kwolek, the DuPont chemist who invented Kevlar, died after a brief illness on June 18. She was 90. Initially, she wanted to be a fashion designer. The light, sturdy and flexible material that she developed from a liquid crystalline solution in 1965, when she was 42, is now ...

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