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Before World War II, parachutes were made of Japanese silk. When supplies were cut off by the war, DuPont persuaded the army to try nylon as a substitute. Adelaide Gray, an employee at a parachute factory, was the first person to test a nylon parachute. A former stunt jumper at air shows, she had begun her skydiving career when still a child, by jumping off haystacks with an umbrella.
