Albert Einstein portrait, famous physicist. Unknown location, unknown date https://www.rawpixel.com/image/6111542/photo-image-public-domain-vintage-personFree Image from public domain licenseAlbert Einstein portrait, famous physicist. Unknown location, unknown date https://www.rawpixel.com/image/6111980/photo-image-light-public-domain-vintageFree Image from public domain licenseAlbert Einstein portrait, famous physicist. Unknown location, unknown date https://www.rawpixel.com/image/6111447/photo-image-public-domain-vintage-personFree Image from public domain licensePaul Ehrlich: his Nobel Prize citation, 29 October 1908. Colour photograph. https://www.rawpixel.com/image/13977347/paul-ehrlich-his-nobel-prize-citation-october-1908-colour-photographFree Image from public domain license