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A man prepares his rockets during the Advanced Rocketery Group (AGROS) flight days in Cernier, Val-de-Ruz, Switzerland, Saturday, March 24, 2018. The group of amateurs and students launched approximately 30 rockets with sizes reaching 250cm in length, 16cm in diameter and a weight of 13kg enabling flights up to a height of 1100m. (KEYSTONE/Valentin Flauraud)