That Sheldon must learn social appropriateness, and sometimes painfully so, makes him appear childlike. This occasions many laughs, but it also serves as a vivid example of Wittgenstein’s objection to Augustine’s view of language acquisition. It seems children cannot acquire an understanding of their mother tongue the way Augustine claims, because the mind of a child is a tabula rasa, a blank slate. This slate will be written on by the experiences a person has during her lifetime. (The Big Bang Theory and Philosophy: Rock, Paper, Scissors, Aristotle, Locke – Edited by Dean A. Kowalski) Does anyone know why the author used 'her'? It seems to me that 'their' would make more sense as we don't know the sex of this person. What do you think? Thank you in advance.