Wind turbine blade used for instruction at Northeast Community College in Norfolk, Nebraska. Original public domain image… https://www.rawpixel.com/image/3340985/free-photo-image-grass-pipeline-plantFree Image from public domain licenseBooted Racket-tail (f) Ocreatus Underwoodii). Original public domain image from Flickr https://www.rawpixel.com/image/6079901/photo-image-public-domain-bird-hummingbirdFree Image from public domain licenseSlovenian Karst (Kras) region, in the distance mount Nanos. Slovenia. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3340775/free-photo-image-vineyard-cc0-countrysideFree Image from public domain licenseST GEORGE'S ROYAL AIR FORCE BATTLE OF BRITAIN CHAPEL BIGGIN HILL. Original public domain image from Flickr https://www.rawpixel.com/image/6081589/photo-image-public-domain-art-personFree Image from public domain licenseThis image was uploaded as part of Wiki Loves e-textbooks contest in Poland. Original public domain image from Wikimedia… https://www.rawpixel.com/image/3338437/free-photo-image-lilac-acanthaceae-blossomFree Image from public domain licenseNymphaea × cultivar, Parc floral de Paris. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3340923/free-photo-image-blossom-cc0-creative-commonsFree Image from public domain licenseA magical moment, watching the first hot air balloon rise with the sun. Cappadocia, Turkey. https://www.rawpixel.com/image/5934389/photo-image-public-domain-balloon-freeFree Image from public domain licenseA Splendid Young Stag before a Wattle Fence (1736) drawing in high resolution by Johann Elias Ridinger. https://www.rawpixel.com/image/8229764/image-art-vintage-public-domainFree Image from public domain licenseMadame DieudonnéOrigin: Bred by Francis Meilland (France, 1947). https://www.rawpixel.com/image/3340584/free-photo-image-blossom-cc0-creative-commonsFree Image from public domain licenseYellow daffodils in a peaceful garden in a city park. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3296838/free-photo-image-blossom-cc0-creative-commonsFree Image from public domain license