Photo of the Week: Happy Birthday, Stephanie Kwolek!

Today, July 31st would have been inventor Stephanie Kwolek’s 95th birthday.  Kwolek was a chemist at DuPont, where she invented Kevlar, the first synthetic material of exceptional strength, which is used in bullet-proof vests.  She has won multiple awards and is featured in the National Inventor’s Hall of Fame.

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