Riley Gaines, a Division I swimmer who competed against transgender swimming celebrity Lia Thomas, went viral last week when asking a University of Pittsburgh anthropology professor a simple question: “If you were to dig up a human, two humans, 100 years from now, both man and woman, could you tell the difference, strictly off of bones?”

The online rancor came not because of the question but rather professor Gabby Yearwood’s assertion that, no, an anthropologist could not determine the gender of a centuriesold skeleton. The denial is not only absurd to the average Joe sensible enough to see the difference between the shapes of skeletons, but especially to ostensible experts who know the details of that difference. For one illustrious example of the immutable binary of biological sex, consider the case of the discovery of the lost corpse of Richard III.