https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13980177Edit ImageSaveSaveEditCropCustom TextGeorge Bidder, a mental calculator, aged twelve. Line engraving by S. Springsguth, 1818.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 748 x 1200 px | 300 dpiLarge JPEG 2182 x 3500 px | 300 dpiBest Quality JPEG 2350 x 3769 px | 300 dpiFree DownloadGeorge Bidder, a mental calculator, aged twelve. Line engraving by S. Springsguth, 1818.More