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" ... Nine years later, in 1965, Kwolek was trying to develop light, strong, rigid fibers to replace the steel wires used in car tires at the time. DuPont could see a gasoline shortage looming (it finally hit with a vengeance in 1973) and engineers thought a lighter, stronger material in tires could help improve cars' gas mileage. Kwolek's work day at the lab consisted mostly of dissolving long chains of molecules called polyamides -- the same type of synthetic polymer used to make materials like nylon -- and then running the solution through a machine that would spin it into fiber. At the time, the molecules DuPont was working with had to be melted at nearly 400 degrees Fahrenheit to be spun, and the heating made the fiber too weak and floppy for the job DuPont's engineers had in mind. Kwolek's job was to find a version that could be spun at lower temperatures. ... "