Strong in the strength of the Lord. We who fight in the people's cause will never stop until that cause is won … https://www.rawpixel.com/image/8905378/image-art-vintage-handFree Image from public domain licenseSeminal Scientist-Musician (in the 19th Century): T.W. Engelmann. Original public domain image from Flickr https://www.rawpixel.com/image/9648560/image-art-medicine-watercolorFree Image from public domain licenseCassandra Imploring Athena for Revenge Against Ajax by Jérôme Martin Langlois https://www.rawpixel.com/image/9184408/image-athena-cassandra-jacques-louis-davidFree Image from public domain licenseDavid Spareth Saul at Hachilah, from Illustrations of the Bible by John Martin https://www.rawpixel.com/image/8982102/david-spareth-saul-hachilah-from-illustrations-the-bible-john-martinFree Image from public domain licensePopes and other churchmen: twenty portraits. Engraving by J.W. Cook, 1825. https://www.rawpixel.com/image/13979494/popes-and-other-churchmen-twenty-portraits-engraving-jw-cook-1825Free Image from public domain licenseSaint John the Baptist as a child, with a lamb, in the wilderness. Engraving by W. Walker after A. van Dyck, 1767. https://www.rawpixel.com/image/13979711/image-cartoon-face-personFree Image from public domain licenseWilliam Cullen. Stipple engraving by F. Holl after D. Martin. https://www.rawpixel.com/image/13971626/william-cullen-stipple-engraving-holl-after-martinFree Image from public domain licenseWilliam Cullen. Line engraving by W. C. Edwards after D. Martin. https://www.rawpixel.com/image/14000359/william-cullen-line-engraving-edwards-after-martinFree Image from public domain licenseBenjamin Franklin. Stipple engraving by C. Goodman & R. Piggott, 1818, after D. Martin, 1767. https://www.rawpixel.com/image/14015844/image-paper-face-personFree Image from public domain licenseJohann Christian Schamberg, standing in front of a bookcase. Line engraving by M. Bernigeroth after D. Hoyer. https://www.rawpixel.com/image/14016829/image-face-person-artFree Image from public domain licenseAmnon, son of David, simulates illness in order to attract his half sister Tamar, who is preparing a meal; in the corner a… https://www.rawpixel.com/image/14020953/image-dog-cartoon-personFree Image from public domain licenseIsaac Barrow. Line engraving by M. Bernigeroth after D. Loggan. https://www.rawpixel.com/image/13997366/isaac-barrow-line-engraving-bernigeroth-after-logganFree Image from public domain licenseBenjamin Franklin. Stipple engraving by T. Kelly after D. Martin, 1767. https://www.rawpixel.com/image/14008500/benjamin-franklin-stipple-engraving-kelly-after-martin-1767Free Image from public domain license