You are what you eat? Maybe not for ancient man

The skull of Paranthropus boisei, also know as the "Nutcracker Man," left, had large teeth, indications of big chewing muscles and thick tooth enamel compared to the skulls of modern-day humans, on the right. Research shows that despite their teeth's large size, the "Nutcracker Man" may not have had a regular diet of hard foods like nuts and seeds or roots and tubers. Credit: Photo by Melissa Lutz Blouin, University of Arkansas