https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/14004888Edit ImageSaveSaveEditCropCustom TextJohn Tyndall. Wood engraving, 1893, after Elliott & Fry.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 1090 x 1200 px | 300 dpiLarge JPEG 2831 x 3116 px | 300 dpiFree DownloadJohn Tyndall. Wood engraving, 1893, after Elliott & Fry.More