Prusias II, King of Bithynia, Reduced to Begging by Boucicaut Master https://www.rawpixel.com/image/14259294/prusias-ii-king-bithynia-reduced-begging-boucicaut-masterFree Image from public domain licenseReflections on the Problem of Race in the 21st Century after 9/11. Original public domain image from Flickr https://www.rawpixel.com/image/9647097/image-person-art-medicineFree Image from public domain licensePentacrinus caput medusae (greatly reduced) Atlantic Dredging. by William Hart https://www.rawpixel.com/image/14306935/pentacrinus-caput-medusae-greatly-reduced-atlantic-dredging-william-hartFree Image from public domain licenseVintage rocket illustration. Remixed by rawpixel. https://www.rawpixel.com/image/10205087/vintage-rocket-illustration-remixed-rawpixelView license