image: Dentitions from human (left), Ar. ramidus (middle), and chimpanzee (right), all males. Below are corresponding samples of the maxillary first molar in each. Red, thicker enamel (~2 mm); blue, thinner enamel (~0.5 mm). Contour lines map the topography of the crown and chewing surfaces. This image relates to an article in the Oct. 2, 2009, issue of Science. It comes from a one-page summary by Dr. Gen Suwa of the University of Tokyo and colleagues, about their paper "Paleobiological Implications of the Ardipithecus ramidus Dentition." view more
Credit: Image courtesy of Science/AAAS