Stock Photo - Andreas Dillmann, head of the Institute of Aerodynamics and Flow Technology at the German Aerospace Center (DLR), poses in front of a Dornier DO 728, in Goettingen, Germany, 15 March 2016. Scientists aim to test the Lilienthal flight apparatus with a facsimile of the 125-year-old original. Photo: SWEN PFOERTNER/dpa | usage worldwide. - Göttingen/Lower Saxony/Germany

Stock Photo: Andreas Dillmann, head of the Institute of Aerodynamics and Flow Technology at the German Aerospace Center (DLR), poses in front of a Dornier DO 728.

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