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Most notably, Kevlar is used to make bulletproof vests, so even though Kwolek did not make it to medical faculty, she still saved numerous lives. In 1964, she was still there, researching how to turn polymers into further-strong artificial fibers. Her next step was to run it by means of the spinneret, a machine that would produce the fibers. Nonetheless, the spinneret operator almost refused to let Kwolek use the machine as a result of he was convinced it would destroy the spinneret. Kwolek persisted, and after the spinneret had carried out its work, Kwolek had a fiber that was ounce-for-ounce as robust as steel. Kwolek was working with polymers that had rod-like molecules that every one lined up in one course.

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