article: Rolling and wheels in the natural world
links: Middle East Jack Cohen Roman Empire Dung beetle George R. R. Martin Sonic the Hedgehog (series) Organ (anatomy) Philip Pullman Vibrio Richard Dawkins Kenyon College Biologist George Washington University ATP synthase University of Illinois at Urbana-Champaign North Africa Eukaryotic Jungle Junction His Dark Materials Clifford D. Simak M. C. Escher Humboldt University of Berlin Latin TED (conference) New Scientist Scrooge McDuck National Public Radio The Straight Dope Chicago Reader Stephen Jay Gould Sonic the Hedgehog (character) Sega The Walt Disney Company Jared Diamond Seed dispersal Zoology L. Frank Baum Animorphs Tissue (biology) Carnegie Mellon University Tumbleweed Carl Barks Miles "Tails" Prower