Fossil teeth can be tricky things. In 1922 paleontologist H.F. Osborn believed that he had found the first evidence of an extinct fossil ape from North America on the basis of a worn molar from Nebraska, but it later turned out to be the tooth of a prehistoric peccary. Four years later, by contrast, Davidson Black named a new species of ancient human on the basis of a handful of teeth recovered from Dragon Bone Hill in China. These turned out to belong to Homo erectus. Both paleontologists made bold steps on the basis of sparingly little evidence, but with entirely different outcomes.

Last week paleoanthropologist Russel Ciochon revealed that lately he has been feeling a bit more