Archive illustration: Dutch Drones performing at the Fiesta del Cielo drone-show festival in Gijón, Spain, on July 15, 2023. This photograph illustrates drone light shows generally; it does not establish use of SPH Engineering technology or inclusion of this event in the reported study. Photo: David Álvarez López, via Wikimedia Commons, CC BY 2.0. Resized and compressed; card thumbnails may be cropped.
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