https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13982892Edit ImageSaveSaveEditCropCustom TextJohn Tyndall. Photograph by Lock & Whitfield.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 930 x 1200 px | 300 dpiLarge JPEG 2363 x 3048 px | 300 dpiFree DownloadJohn Tyndall. Photograph by Lock & Whitfield.More