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Digitally enhanced from our own edition of Solar Biology by Hiram Erastus Butler… https://www.rawpixel.com/image/3276580/illustration-image-art-blackFree Image from public domain licenseHuman Skeleton, Anterior View (Finished Study for Table I), (1795–1806) drawing in high resolution by George Stubbs.… https://www.rawpixel.com/image/3820049/illustration-image-art-peopleFree Image from public domain licenseHeart png clip art, vintage medical illustration on transparent background. Free public domain CC0 image. https://www.rawpixel.com/image/6481208/png-sticker-heartFree PNG from public domain licenseIllustration of a giraffe from Dictionnaire des Sciences Naturelles by Pierre Jean Francois Turpin (1840). 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