ST. LOUIS, MISSOURI—An international team of scientists has used biomedical methods and engineering tools to analyze the facial skeleton of Australopithecus sediba. “Most australopiths had amazing adaptations in their jaws, teeth and faces that allowed them to process foods that were difficult to chew or crack open. Among other things, they were able to efficiently bite down on foods at very high forces,” David Strait of Washington University in St. Louis explained in a press release. But the new tests indicate that Australopithecus sediba may have been able to eat some hard foods, but it did not possess a powerful bite. “If it had bitten as hard as possible on its molar teeth using the full force of its chewing muscles, it would have dislocated its jaw,” explained Justin Ledogar of Australia’s University of New England. “Humans also have this limitation on biting forcefully and we suspect that early Homo had it as well,” added Ledogar. So while some australopiths evolved to bite powerfully, others did not. “Diet is likely to have played a key role in the origin of Homo,” Strait said. For more on Australopithecus sediba, go to "The Human Mosaic."