Caption: "Animation of a rotating DNA structure." DNA is, of course, a very complex organic molecule.

Credit/Permission: User:Brian0918, before or circa 2005 (uploaded to Wikipedia by User:Magadan, 2005) / Public domain.
Image link: Wikipedia: File:DNA animation.gif.
Local file: local link: dna_rotating.html.
File: Biology file: dna_rotating.html.