The girls are required to partake in the making of their chardonnay.  At least understand the general process in making wine. Gemma, has an ability to learn and regurgitate information on command and in the lab this is no exception. After dinner one night you could hear the girls playing Harry Potter, using their dinner chopsticks as wands, when suddenly she starts chanting "'diammonium phosphate, centrifugal force".  Needless to say she won that battle.