The elements of astronomy (1919) illustrated by Charles Augustus. Original public domain image from Wikimedia Commons.… https://www.rawpixel.com/image/10184737/image-galaxy-face-personFree Image from public domain licenseFree fresh salad in bowl on wooden table photo, public domain CC0 photo. https://www.rawpixel.com/image/5923826/photo-image-background-public-domain-plantFree Image from public domain licenseSt. Louis Red Cross Motor Corps on duty during influenza epidemic (1918). Original from Library of Congress. Digitally… https://www.rawpixel.com/image/2301122/free-photo-image-vintage-spanish-flu-womanFree Image from public domain licenseFree green botanical landscape image, public domain landscape CC0 photo. https://www.rawpixel.com/image/5923135/photo-image-light-public-domain-treesFree Image from public domain licenseIt's Hard to Know Where Our Love is Leading: But Let's Keep Giving, Okay? Vintage poster. https://www.rawpixel.com/image/10993984/image-christmas-medicine-artsFree Image from public domain licenseWoman protrait. Free public domain CC0 photo, free public domain CC0 image. https://www.rawpixel.com/image/5922445/photo-image-light-public-domain-handFree Image from public domain licenseAmerican Red Cross canteen workers taking food for family infected with the flu, Charlotte, North Carolina (1918). Original… https://www.rawpixel.com/image/2301114/free-photo-image-vintage-virus-foodFree Image from public domain licenseWinton Churchill, former prime minister of the UK - unknown date & location https://www.rawpixel.com/image/6111407/photo-image-public-domain-person-freeFree Image from public domain licenseA woman taking photos of a lake, surrounded by trees with orange and yellow leaves in herastrau park. Original public domain… https://www.rawpixel.com/image/3336888/free-photo-image-park-landscape-photography-fall-lakeFree Image from public domain licenseFree guitar image, public domain musical instrument CC0 photo. https://www.rawpixel.com/image/5901140/photo-image-white-background-light-public-domainFree Image from public domain licenseWalter Reed Hospital flu ward (ca. 1910–1920). Original from Library of Congress. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/2301131/free-photo-image-spanish-flu-nurse-1918Free Image from public domain licenseFree roses and music sheets image, public domain aesthetic CC0 photo. https://www.rawpixel.com/image/5924085/photo-image-background-wallpaper-aestheticFree Image from public domain licenseWhen the Heart Is Weak: Gray's Glycerine Tonic Comp (between 1890 and 1915) Collection: Images from the History of Medicine… https://www.rawpixel.com/image/10993979/image-heart-medicine-abstractFree Image from public domain licenseAir Force in Space (1995) illustrated by Tish Tompkins. Original public domain image from Wikimedia Commons. Digitally… https://www.rawpixel.com/image/10184890/image-astronaut-face-personFree Image from public domain licenseFree Amsterdam in the evening image, public domain traveling CC0 photo. https://www.rawpixel.com/image/5924570/photo-image-lights-public-domain-treesFree Image from public domain licenseBoy beside Store Window Display of Christmas Ornaments. Original from Library of Congress. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/1232771/photograph-boy-christmas-storeFree Image from public domain licenseFree fresh food on wooden table image, healthy groceries, public domain CC0 photo. https://www.rawpixel.com/image/5924737/photo-image-public-domain-plant-greenFree Image from public domain licenseCaucasian boy playing with a camera https://www.rawpixel.com/image/424687/kid-photographerView licenseFree woman doing yoga pose by the beach image, public domain sport CC0 photo. https://www.rawpixel.com/image/5912948/photo-image-light-public-domain-natureFree Image from public domain licenseTwo U.S. Air Force F-16C Fighting Falcons from the New Jersey Air National Guard's 177th Fighter Wing fly over Yankee… https://www.rawpixel.com/image/3578753/free-photo-image-stadium-afbday-air-national-guardFree Image from public domain licenseClassic car series, Blue Roadster (1944) drawing by Theodore Wells Pietsch II. Original public domain image from Wikipedia.… https://www.rawpixel.com/image/10542357/image-face-person-artsFree Image from public domain licenseFree Paris Eiffel Tower during daytime photo, public domain building CC0 image. https://www.rawpixel.com/image/5925311/photo-image-cloud-public-domain-artFree Image from public domain license