Kevlar exists because one cloudy, watery batch looked too wrong to test.
Stephanie Kwolek was a DuPont chemist researching lightweight tire fibers in 1965. The polymer solution she made was unusually thin and hazy — so unlike nylon that her technician refused to run it, fearing it would clog. She insisted. What emerged was five times stronger than steel. DuPont owned the patent, which she had signed over, and she never benefited from it financially.
Kevlar on Brandseum