If the June 6, 1944, thousands of paratroopers involved in the Landing, this is a little thanks to the feat achieved, exactly two years earlier, by a young American named Adeline Gray. On June 6, 1942, this superb grandpa that we would see more in the central page of Playboy to test parachutes is the first parachutist to test an umbrella in nylon instead of silk. This material, invented four years earlier by du Pont de Nemours, has the advantage of presenting all the characteristics of the silk, while being much less expensive. In a first step, the nylon is designed...

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